<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
    body {
      background: #ffffff;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
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      justify-content: space-between;
      min-height: 100%;
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    .stepper {
      display: flex;
      gap: 6px;
      margin-bottom: 10px;
    }
    .step-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 5px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #1e2945;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .step-btn.active {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
    }

    .section {
      width: 100%;
      max-width: 480px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 12px 10px;
      margin-bottom: 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
    }

    .section-title {
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #64748b;
      margin-bottom: 8px;
    }

    .badge-row {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 8px;
      min-height: 52px;
    }

    .badge {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: #ffffff;
      border: 2px solid #cbd5e1;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      font-weight: 700;
      color: #1e2945;
      position: relative;
      transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* Crossed off state */
    .badge.crossed {
      color: #94a3b8;
      background: #f1f5f9;
      border-color: #e2e8f0;
      opacity: 0.6;
    }
    .badge.crossed::after {
      content: "";
      position: absolute;
      width: 80%;
      height: 2px;
      background: #ef4444;
      transform: rotate(-45deg);
    }

    /* Winner median badge */
    .badge.median-pill {
      background: #10b981;
      border-color: #10b981;
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35);
      transform: scale(1.08);
      z-index: 2;
    }

    /* Even pair highlights */
    .badge.even-mid {
      background: #eff6ff;
      border-color: #3b82f6;
      color: #1d4ed8;
    }

    .result-badge {
      margin-top: 6px;
      font-size: 13px;
      font-weight: 700;
      color: #10b981;
      background: #ecfdf5;
      border: 1px solid #a7f3d0;
      border-radius: 16px;
      padding: 3px 12px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: opacity 0.2s ease;
    }

    .even-calc {
      margin-top: 8px;
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
    }
    .even-calc .formula {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      padding: 2px 8px;
      color: #1e2945;
    }
    .even-calc .final {
      background: #10b981;
      color: #ffffff;
      border-radius: 8px;
      padding: 2px 8px;
    }
  </style>
</head>
<body>

  
  <div class="stepper">
    <button class="step-btn active" id="btn1" onclick="setStep(1)">1. Raw</button>
    <button class="step-btn" id="btn2" onclick="setStep(2)">2. Order</button>
    <button class="step-btn" id="btn3" onclick="setStep(3)">3. Median</button>
  </div>

  
  <div class="section">
    <div class="section-title">Odd Count (5 values)</div>
    <div class="badge-row" id="oddRow">
      <div class="badge" id="b0">12</div>
      <div class="badge" id="b1">4</div>
      <div class="badge" id="b2">18</div>
      <div class="badge" id="b3">4</div>
      <div class="badge" id="b4">22</div>
    </div>
    <div class="result-badge" id="oddResult" style="opacity: 0;">Median = 12</div>
  </div>

  
  <div class="section">
    <div class="section-title">Even Count (4 values)</div>
    <div class="badge-row">
      <div class="badge crossed">4</div>
      <div class="badge even-mid">8</div>
      <div class="badge even-mid">12</div>
      <div class="badge crossed">16</div>
    </div>
    <div class="even-calc">
      <span class="formula">(8 + 12) ÷ 2</span>
      <span>=</span>
      <span class="final">Median = 10</span>
    </div>
  </div>

  <script>
    const data = [
      { values: [12, 4, 18, 4, 22], classes: ['', '', '', '', ''], res: 0 },
      { values: [4, 4, 12, 18, 22], classes: ['', '', '', '', ''], res: 0 },
      { values: [4, 4, 12, 18, 22], classes: ['crossed', 'crossed', 'median-pill', 'crossed', 'crossed'], res: 1 }
    ];

    let currentStep = 1;
    let timer = null;

    function setStep(step) {
      currentStep = step;
      document.querySelectorAll('.step-btn').forEach((btn, idx) => {
        btn.classList.toggle('active', idx === step - 1);
      });

      const d = data[step - 1];
      for (let i = 0; i < 5; i++) {
        const el = document.getElementById('b' + i);
        el.textContent = d.values[i];
        el.className = 'badge ' + d.classes[i];
      }
      document.getElementById('oddResult').style.opacity = d.res ? '1' : '0';
    }

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      setStep(next);
    }

    timer = setInterval(autoPlay, 3500);

    document.querySelectorAll('.step-btn').forEach(btn => {
      btn.addEventListener('click', () => {
        clearInterval(timer);
      });
    });
  </script>
</body>
</html>

Calculating the Mean, Median, Mode, and Range of Raw Data Sets

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: #ffffff;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      min-height: 100%;
      justify-content: center;
    }
    .panel {
      background: #fbfcfd;
      border: 1px solid #e6e6e6;
      border-radius: 10px;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .header {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .tag {
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
      background: #eef2f6;
      padding: 3px 8px;
      border-radius: 6px;
    }
    .tag.highlight {
      background: #e0f2fe;
      color: #0369a1;
    }
    .mode-result {
      font-size: 13px;
      font-weight: 700;
      color: #64748b;
    }
    .mode-result.active {
      color: #0284c7;
    }
    .items {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      align-items: center;
    }
    .item {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      background: #ffffff;
      border: 1.5px solid #e6e6e6;
      border-radius: 8px;
      padding: 6px 10px;
      min-width: 44px;
      cursor: pointer;
      user-select: none;
      transition: background-color 0.2s ease, border-color 0.2s ease;
    }
    .item.mode {
      border-color: #0284c7;
      background: #f0f9ff;
      box-shadow: 0 2px 5px rgba(2, 132, 199, 0.15);
    }
    .val {
      font-size: 16px;
      font-weight: 800;
      color: #1e2945;
      line-height: 1;
    }
    .badge {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 10px;
      background: #f1f5f9;
      color: #64748b;
      line-height: 1;
    }
    .item.mode .badge {
      background: #0284c7;
      color: #ffffff;
    }
    .tallies {
      display: flex;
      gap: 2px;
      height: 8px;
      align-items: center;
    }
    .bar {
      width: 2px;
      height: 8px;
      background: #94a3b8;
      border-radius: 1px;
    }
    .item.mode .bar {
      background: #0284c7;
    }
  </style>
</head>
<body>

  
  <div class="panel">
    <div class="header">
      <span class="tag highlight">Single Mode</span>
      <span class="mode-result active">Mode = 4</span>
    </div>
    <div class="items">
      <div class="item mode">
        <span class="val">4</span>
        <div class="tallies"><span class="bar"></span><span class="bar"></span></div>
        <span class="badge">×2</span>
      </div>
      <div class="item">
        <span class="val">12</span>
        <div class="tallies"><span class="bar"></span></div>
        <span class="badge">×1</span>
      </div>
      <div class="item">
        <span class="val">18</span>
        <div class="tallies"><span class="bar"></span></div>
        <span class="badge">×1</span>
      </div>
      <div class="item">
        <span class="val">22</span>
        <div class="tallies"><span class="bar"></span></div>
        <span class="badge">×1</span>
      </div>
    </div>
  </div>

  
  <div class="panel">
    <div class="header">
      <span class="tag highlight">Bimodal (Two Modes)</span>
      <span class="mode-result active">Modes = 2, 7</span>
    </div>
    <div class="items">
      <div class="item mode">
        <span class="val">2</span>
        <div class="tallies"><span class="bar"></span><span class="bar"></span></div>
        <span class="badge">×2</span>
      </div>
      <div class="item">
        <span class="val">5</span>
        <div class="tallies"><span class="bar"></span></div>
        <span class="badge">×1</span>
      </div>
      <div class="item mode">
        <span class="val">7</span>
        <div class="tallies"><span class="bar"></span><span class="bar"></span></div>
        <span class="badge">×2</span>
      </div>
    </div>
  </div>

  
  <div class="panel">
    <div class="header">
      <span class="tag">No Mode</span>
      <span class="mode-result">None</span>
    </div>
    <div class="items">
      <div class="item">
        <span class="val">3</span>
        <div class="tallies"><span class="bar"></span></div>
        <span class="badge">×1</span>
      </div>
      <div class="item">
        <span class="val">6</span>
        <div class="tallies"><span class="bar"></span></div>
        <span class="badge">×1</span>
      </div>
      <div class="item">
        <span class="val">9</span>
        <div class="tallies"><span class="bar"></span></div>
        <span class="badge">×1</span>
      </div>
      <div class="item">
        <span class="val">11</span>
        <div class="tallies"><span class="bar"></span></div>
        <span class="badge">×1</span>
      </div>
    </div>
  </div>

  <script>
    document.querySelectorAll('.item').forEach(item => {
      item.addEventListener('click', () => {
        item.style.filter = 'brightness(0.95)';
        setTimeout(() => { item.style.filter = 'none'; }, 150);
      });
    });
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8f9fa;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 16px;
      user-select: none;
    }

    .header-bar {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin-bottom: 8px;
    }

    .calc-box {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 8px 16px;
      font-size: 16px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 6px;
      color: #1e2945;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    }

    .badge {
      display: inline-block;
      padding: 2px 8px;
      border-radius: 6px;
      font-size: 14px;
      font-weight: 700;
    }
    .badge-max { background: #dbeafe; color: #1d4ed8; }
    .badge-min { background: #fef3c7; color: #b45309; }
    .badge-range { background: #fef3c7; color: #d97706; border: 1px solid #f59e0b; }

    .svg-container {
      width: 100%;
      max-width: 580px;
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    svg {
      width: 100%;
      height: auto;
      overflow: visible;
    }

    /* Interactive button bar */
    .controls {
      display: flex;
      gap: 8px;
      margin-top: 8px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .step-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #475569;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .step-btn.active {
      background: #1e2945;
      border-color: #1e2945;
      color: #ffffff;
    }

    /* SVG Transitions */
    .span-group, .data-point, .marker-label {
      transition: opacity 0.3s ease, transform 0.3s ease;
    }
  </style>
</head>
<body>

  
  <div class="header-bar">
    <div class="calc-box" id="calcDisplay">
      <span>Range =</span>
      <span class="badge badge-max" id="maxTerm">Max (22)</span>
      <span>−</span>
      <span class="badge badge-min" id="minTerm">Min (4)</span>
      <span>=</span>
      <span class="badge badge-range" id="rangeTerm">18</span>
    </div>
  </div>

  
  <div class="svg-container">
    <svg viewBox="0 0 560 210" aria-label="Number line showing range from 4 to 22">
      
      <defs>
        <marker id="arrow-left" viewBox="0 0 10 10" refX="2" refY="5" markerWidth="6" markerHeight="6" orient="auto">
          <path d="M 8 1 L 2 5 L 8 9" fill="none" stroke="#f59e0b" stroke-width="2" stroke-linecap="round"/>
        </marker>
        <marker id="arrow-right" viewBox="0 0 10 10" refX="8" refY="5" markerWidth="6" markerHeight="6" orient="auto">
          <path d="M 2 1 L 8 5 L 2 9" fill="none" stroke="#f59e0b" stroke-width="2" stroke-linecap="round"/>
        </marker>
      </defs>

      
      <g id="spanGroup" class="span-group">
        
        <rect x="128" y="58" width="360" height="74" fill="#fef3c7" fill-opacity="0.4" rx="6" />
        
        
        <line x1="128" y1="58" x2="128" y2="132" stroke="#f59e0b" stroke-width="2" stroke-dasharray="3,3" />
        <line x1="488" y1="58" x2="488" y2="132" stroke="#f59e0b" stroke-width="2" stroke-dasharray="3,3" />
        
        
        <line x1="134" y1="72" x2="482" y2="72" stroke="#f59e0b" stroke-width="3" marker-start="url(#arrow-left)" marker-end="url(#arrow-right)" />
        
        
        <rect x="254" y="56" width="108" height="30" rx="6" fill="#f59e0b" />
        <text x="308" y="76" font-size="14" font-weight="700" fill="#ffffff" text-anchor="middle">Range = 18</text>
      </g>

      
      
      <line x1="38" y1="140" x2="558" y2="140" stroke="#94a3b8" stroke-width="2.5" stroke-linecap="round" />
      <polygon points="556,136 564,140 556,144" fill="#94a3b8" />

      
      
      <line x1="48" y1="134" x2="48" y2="146" stroke="#64748b" stroke-width="2" />
      <text x="48" y="164" font-size="14" font-weight="600" fill="#64748b" text-anchor="middle">0</text>
      
      <line x1="148" y1="134" x2="148" y2="146" stroke="#64748b" stroke-width="2" />
      <text x="148" y="164" font-size="14" font-weight="600" fill="#64748b" text-anchor="middle">5</text>
      
      <line x1="248" y1="134" x2="248" y2="146" stroke="#64748b" stroke-width="2" />
      <text x="248" y="164" font-size="14" font-weight="600" fill="#64748b" text-anchor="middle">10</text>
      
      <line x1="348" y1="134" x2="348" y2="146" stroke="#64748b" stroke-width="2" />
      <text x="348" y="164" font-size="14" font-weight="600" fill="#64748b" text-anchor="middle">15</text>
      
      <line x1="448" y1="134" x2="448" y2="146" stroke="#64748b" stroke-width="2" />
      <text x="448" y="164" font-size="14" font-weight="600" fill="#64748b" text-anchor="middle">20</text>
      
      <line x1="548" y1="134" x2="548" y2="146" stroke="#64748b" stroke-width="2" />
      <text x="548" y="164" font-size="14" font-weight="600" fill="#64748b" text-anchor="middle">25</text>

      
      <path d="
        M 68,137 v6 M 88,137 v6 M 108,137 v6 M 128,137 v6 
        M 168,137 v6 M 188,137 v6 M 208,137 v6 M 228,137 v6 
        M 268,137 v6 M 288,137 v6 M 308,137 v6 M 328,137 v6 
        M 368,137 v6 M 388,137 v6 M 408,137 v6 M 428,137 v6 
        M 468,137 v6 M 488,137 v6 M 508,137 v6 M 528,137 v6" 
        stroke="#cbd5e1" stroke-width="1.5" />

      
      
      <g id="ptMin" class="data-point">
        <circle cx="128" cy="140" r="8" fill="#d97706" stroke="#ffffff" stroke-width="2" />
        <rect x="100" y="174" width="56" height="22" rx="4" fill="#fef3c7" stroke="#f59e0b" stroke-width="1" />
        <text x="128" y="189" font-size="12" font-weight="700" fill="#b45309" text-anchor="middle">Min (4)</text>
      </g>

      
      <g id="pt12" class="data-point">
        <circle cx="288" cy="140" r="7" fill="#64748b" stroke="#ffffff" stroke-width="2" />
        <text x="288" y="124" font-size="13" font-weight="700" fill="#1e2945" text-anchor="middle">12</text>
      </g>

      
      <g id="pt18" class="data-point">
        <circle cx="408" cy="140" r="7" fill="#64748b" stroke="#ffffff" stroke-width="2" />
        <text x="408" y="124" font-size="13" font-weight="700" fill="#1e2945" text-anchor="middle">18</text>
      </g>

      
      <g id="ptMax" class="data-point">
        <circle cx="488" cy="140" r="8" fill="#2563eb" stroke="#ffffff" stroke-width="2" />
        <rect x="460" y="174" width="56" height="22" rx="4" fill="#dbeafe" stroke="#3b82f6" stroke-width="1" />
        <text x="488" y="189" font-size="12" font-weight="700" fill="#1d4ed8" text-anchor="middle">Max (22)</text>
      </g>
    </svg>
  </div>

  
  <div class="controls">
    <button class="step-btn" id="btn0" onclick="setStep(0)">1. Plot Points</button>
    <button class="step-btn" id="btn1" onclick="setStep(1)">2. Identify Min &amp; Max</button>
    <button class="step-btn active" id="btn2" onclick="setStep(2)">3. Find Range</button>
  </div>

  <script>
    function setStep(step) {
      const spanGroup = document.getElementById('spanGroup');
      const minBox = document.getElementById('ptMin').querySelector('rect');
      const minText = document.getElementById('ptMin').querySelector('text');
      const maxBox = document.getElementById('ptMax').querySelector('rect');
      const maxText = document.getElementById('ptMax').querySelector('text');
      const calcDisplay = document.getElementById('calcDisplay');

      // Update button states
      document.querySelectorAll('.step-btn').forEach((btn, idx) => {
        btn.classList.toggle('active', idx === step);
      });

      if (step === 0) {
        // Just points
        spanGroup.style.opacity = '0';
        minBox.style.display = 'none';
        minText.style.display = 'none';
        maxBox.style.display = 'none';
        maxText.style.display = 'none';
        calcDisplay.style.opacity = '0.3';
      } else if (step === 1) {
        // Min & Max highlighted
        spanGroup.style.opacity = '0';
        minBox.style.display = 'block';
        minText.style.display = 'block';
        maxBox.style.display = 'block';
        maxText.style.display = 'block';
        calcDisplay.style.opacity = '0.7';
      } else {
        // Full Range View
        spanGroup.style.opacity = '1';
        minBox.style.display = 'block';
        minText.style.display = 'block';
        maxBox.style.display = 'block';
        maxText.style.display = 'block';
        calcDisplay.style.opacity = '1';
      }
    }

    // Initialize to full range step
    setStep(2);
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="1:1">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: transparent;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      min-height: 100%;
      user-select: none;
    }

    /* Dataset Strip */
    .dataset-container {
      background: #ffffff;
      border: 1px solid #e6e6e6;
      border-radius: 12px;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .dataset-label {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: #64748b;
    }

    .data-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      flex-wrap: wrap;
      width: 100%;
    }

    .data-node {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      width: 44px;
      height: 42px;
      border-radius: 8px;
      border: 1.5px solid #e6e6e6;
      background: #f8fafc;
      font-size: 15px;
      font-weight: 700;
      color: #1e2945;
      transition: all 0.25s ease;
      position: relative;
    }

    .node-tag {
      font-size: 9px;
      font-weight: 700;
      text-transform: uppercase;
      line-height: 1;
      margin-top: 1px;
      opacity: 0;
      transition: opacity 0.2s ease;
    }

    /* Active Highlight States on Dataset Nodes */
    /* Mean */
    .mode-mean .data-node {
      border-color: #2563eb;
      background: #eff6ff;
      color: #1d4ed8;
    }

    /* Median */
    .mode-median .data-node.med-mid {
      border-color: #059669;
      background: #ecfdf5;
      color: #047857;
      box-shadow: 0 0 0 2px rgba(5, 150, 105, 0.2);
    }
    .mode-median .data-node.med-mid .node-tag {
      opacity: 1;
      color: #059669;
    }
    .mode-median .data-node:not(.med-mid) {
      opacity: 0.45;
    }

    /* Mode */
    .mode-mode .data-node.mod-match {
      border-color: #7c3aed;
      background: #f5f3ff;
      color: #6d28d9;
      box-shadow: 0 0 0 2px rgba(124, 58, 237, 0.2);
    }
    .mode-mode .data-node.mod-match .node-tag {
      opacity: 1;
      color: #7c3aed;
    }
    .mode-mode .data-node:not(.mod-match) {
      opacity: 0.45;
    }

    /* Range */
    .mode-range .data-node.rng-min {
      border-color: #d97706;
      background: #fffbeb;
      color: #b45309;
      box-shadow: 0 0 0 2px rgba(217, 119, 6, 0.2);
    }
    .mode-range .data-node.rng-max {
      border-color: #d97706;
      background: #fffbeb;
      color: #b45309;
      box-shadow: 0 0 0 2px rgba(217, 119, 6, 0.2);
    }
    .mode-range .data-node.rng-min .node-tag,
    .mode-range .data-node.rng-max .node-tag {
      opacity: 1;
      color: #d97706;
    }
    .mode-range .data-node:not(.rng-min):not(.rng-max) {
      opacity: 0.45;
    }

    /* 2x2 Grid */
    .grid-2x2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      flex: 1;
    }

    .measure-card {
      background: #ffffff;
      border: 1.5px solid #e6e6e6;
      border-radius: 12px;
      padding: 12px 14px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      cursor: pointer;
      position: relative;
      overflow: hidden;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .measure-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
    }

    /* Card Top Accent Bars */
    .card-mean::before { background: #2563eb; }
    .card-median::before { background: #059669; }
    .card-mode::before { background: #7c3aed; }
    .card-range::before { background: #d97706; }

    .measure-card.active {
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    }
    .card-mean.active { border-color: #2563eb; background: #fafcff; }
    .card-median.active { border-color: #059669; background: #fafdfb; }
    .card-mode.active { border-color: #7c3aed; background: #faf8ff; }
    .card-range.active { border-color: #d97706; background: #fffdfa; }

    .card-header {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      margin-bottom: 6px;
    }

    .card-title {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.04em;
    }

    .card-mean .card-title { color: #2563eb; }
    .card-median .card-title { color: #059669; }
    .card-mode .card-title { color: #7c3aed; }
    .card-range .card-title { color: #d97706; }

    .card-value {
      font-size: 24px;
      font-weight: 800;
      line-height: 1;
    }

    .card-mean .card-value { color: #1d4ed8; }
    .card-median .card-value { color: #047857; }
    .card-mode .card-value { color: #6d28d9; }
    .card-range .card-value { color: #b45309; }

    .card-calc {
      display: flex;
      flex-direction: column;
      gap: 3px;
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
      line-height: 1.35;
      border-top: 1px dashed #e6e6e6;
      padding-top: 6px;
    }

    .calc-step {
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      font-size: 11.5px;
      color: #1e2945;
    }

    /* Sub-text / summary tip */
    .instruction-bar {
      text-align: center;
      font-size: 11px;
      font-weight: 600;
      color: #94a3b8;
    }

    @media (max-width: 360px) {
      .data-node {
        width: 38px;
        height: 38px;
        font-size: 13px;
      }
      .card-value {
        font-size: 20px;
      }
      .grid-2x2 {
        gap: 8px;
      }
      .measure-card {
        padding: 10px;
      }
    }
  </style>
</head>
<body>

  
  <div class="dataset-container" id="datasetContainer">
    <div class="dataset-label">Ordered Dataset (n = 6)</div>
    <div class="data-row">
      <div class="data-node rng-min" id="n0">
        <span>70</span>
        <span class="node-tag">Min</span>
      </div>
      <div class="data-node" id="n1">
        <span>75</span>
        <span class="node-tag"></span>
      </div>
      <div class="data-node med-mid" id="n2">
        <span>85</span>
        <span class="node-tag">Mid</span>
      </div>
      <div class="data-node med-mid mod-match" id="n3">
        <span>90</span>
        <span class="node-tag">Mid</span>
      </div>
      <div class="data-node mod-match" id="n4">
        <span>90</span>
        <span class="node-tag">Mode</span>
      </div>
      <div class="data-node rng-max" id="n5">
        <span>100</span>
        <span class="node-tag">Max</span>
      </div>
    </div>
  </div>

  
  <div class="grid-2x2">
    
    <div class="measure-card card-mean" data-measure="mean">
      <div class="card-header">
        <span class="card-title">Mean</span>
        <span class="card-value">85</span>
      </div>
      <div class="card-calc">
        <span>Sum ÷ Count</span>
        <span class="calc-step">510 ÷ 6 = 85</span>
      </div>
    </div>

    
    <div class="measure-card card-median" data-measure="median">
      <div class="card-header">
        <span class="card-title">Median</span>
        <span class="card-value">87.5</span>
      </div>
      <div class="card-calc">
        <span>Middle Average</span>
        <span class="calc-step">(85 + 90) ÷ 2</span>
      </div>
    </div>

    
    <div class="measure-card card-mode" data-measure="mode">
      <div class="card-header">
        <span class="card-title">Mode</span>
        <span class="card-value">90</span>
      </div>
      <div class="card-calc">
        <span>Most Frequent</span>
        <span class="calc-step">90 appears 2×</span>
      </div>
    </div>

    
    <div class="measure-card card-range" data-measure="range">
      <div class="card-header">
        <span class="card-title">Range</span>
        <span class="card-value">30</span>
      </div>
      <div class="card-calc">
        <span>Max − Min</span>
        <span class="calc-step">100 − 70 = 30</span>
      </div>
    </div>
  </div>

  <div class="instruction-bar">Tap a measure to highlight its data</div>

  <script>
    const cards = document.querySelectorAll('.measure-card');
    const container = document.getElementById('datasetContainer');

    function setMeasure(measure) {
      cards.forEach(c => {
        if (c.dataset.measure === measure) {
          c.classList.add('active');
        } else {
          c.classList.remove('active');
        }
      });

      container.className = 'dataset-container mode-' + measure;
    }

    cards.forEach(card => {
      card.addEventListener('click', () => {
        const m = card.dataset.measure;
        if (card.classList.contains('active')) {
          card.classList.remove('active');
          container.className = 'dataset-container';
        } else {
          setMeasure(m);
        }
      });
    });

    // Default to initial clean state
    setMeasure('mean');
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
      background: #f8f9fa;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
      gap: 12px;
    }

    /* Controls */
    .controls {
      display: flex;
      gap: 8px;
      width: 100%;
      max-width: 440px;
      justify-content: center;
    }

    .btn {
      flex: 1;
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 8px;
      border: 1px solid #e6e6e6;
      background: #ffffff;
      color: #1e2945;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    }

    .btn.active {
      background: #22b7ff;
      color: #ffffff;
      border-color: #22b7ff;
      box-shadow: 0 2px 6px rgba(34, 183, 255, 0.35);
    }

    /* Chart Container */
    .chart-container {
      position: relative;
      width: 100%;
      max-width: 440px;
      height: 190px;
      background: #ffffff;
      border: 1px solid #e6e6e6;
      border-radius: 12px;
      padding: 24px 16px 28px 16px;
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
    }

    /* Mean Target Line */
    .mean-line {
      position: absolute;
      left: 16px;
      right: 16px;
      bottom: calc(28px + (12 / 24) * (190px - 52px));
      border-top: 2px dashed #0284c7;
      pointer-events: none;
      z-index: 2;
    }

    .mean-tag {
      position: absolute;
      right: 0;
      top: -20px;
      font-size: 12px;
      font-weight: 700;
      color: #0284c7;
      background: #e0f2fe;
      padding: 1px 6px;
      border-radius: 4px;
    }

    /* Columns */
    .col-wrap {
      flex: 1;
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      align-items: center;
      position: relative;
      z-index: 1;
    }

    .bar-value {
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
      margin-bottom: 4px;
      transition: transform 0.5s ease, opacity 0.3s;
    }

    .bar {
      width: 65%;
      max-width: 44px;
      background: #22b7ff;
      border-radius: 6px 6px 0 0;
      transition: height 0.6s cubic-bezier(0.34, 1.2, 0.64, 1), background-color 0.4s;
    }

    .col-label {
      position: absolute;
      bottom: -22px;
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
    }

    /* Leveled state styling */
    .leveled .bar {
      background: #0284c7;
    }

    /* Formula Card */
    .formula-card {
      width: 100%;
      max-width: 440px;
      background: #ffffff;
      border: 1px solid #e6e6e6;
      border-radius: 10px;
      padding: 10px 14px;
      display: flex;
      flex-direction: column;
      gap: 6px;
      font-size: 13px;
    }

    .math-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-weight: 600;
    }

    .math-highlight {
      color: #0284c7;
      font-weight: 700;
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <button id="btnRaw" class="btn active">Original Scores</button>
    <button id="btnLevel" class="btn">Level Out (Mean)</button>
  </div>

  
  <div id="chart" class="chart-container">
    <div class="mean-line">
      <span class="mean-tag">Mean = 12</span>
    </div>

    <div class="col-wrap">
      <span class="bar-value" id="val0">12</span>
      <div class="bar" id="bar0" style="height: 50%;"></div>
      <span class="col-label">G1</span>
    </div>

    <div class="col-wrap">
      <span class="bar-value" id="val1">4</span>
      <div class="bar" id="bar1" style="height: 16.67%;"></div>
      <span class="col-label">G2</span>
    </div>

    <div class="col-wrap">
      <span class="bar-value" id="val2">18</span>
      <div class="bar" id="bar2" style="height: 75%;"></div>
      <span class="col-label">G3</span>
    </div>

    <div class="col-wrap">
      <span class="bar-value" id="val3">4</span>
      <div class="bar" id="bar3" style="height: 16.67%;"></div>
      <span class="col-label">G4</span>
    </div>

    <div class="col-wrap">
      <span class="bar-value" id="val4">22</span>
      <div class="bar" id="bar4" style="height: 91.67%;"></div>
      <span class="col-label">G5</span>
    </div>
  </div>

  
  <div class="formula-card">
    <div class="math-row">
      <span>Sum: 12 + 4 + 18 + 4 + 22</span>
      <span class="math-highlight">= 60</span>
    </div>
    <div class="math-row">
      <span>Mean: 60 ÷ 5</span>
      <span class="math-highlight">= 12</span>
    </div>
  </div>

  <script>
    const rawScores = [12, 4, 18, 4, 22];
    const meanScore = 12;
    const maxScale = 24;

    const chart = document.getElementById('chart');
    const btnRaw = document.getElementById('btnRaw');
    const btnLevel = document.getElementById('btnLevel');

    const bars = rawScores.map((_, i) => document.getElementById('bar' + i));
    const vals = rawScores.map((_, i) => document.getElementById('val0'.replace('0', i)));

    function setView(isLeveled) {
      if (isLeveled) {
        chart.classList.add('leveled');
        btnLevel.classList.add('active');
        btnRaw.classList.remove('active');

        bars.forEach((bar, i) => {
          bar.style.height = ((meanScore / maxScale) * 100) + '%';
          vals[i].textContent = meanScore;
        });
      } else {
        chart.classList.remove('leveled');
        btnRaw.classList.add('active');
        btnLevel.classList.remove('active');

        bars.forEach((bar, i) => {
          bar.style.height = ((rawScores[i] / maxScale) * 100) + '%';
          vals[i].textContent = rawScores[i];
        });
      }
    }

    btnRaw.addEventListener('click', () => setView(false));
    btnLevel.addEventListener('click', () => setView(true));
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      padding: 8px;
    }

    .diagram-wrap {
      width: 100%;
      max-width: 620px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
    }

    .control-row {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      justify-content: center;
      width: 100%;
    }

    .chip-btn {
      background: #f1f5f9;
      border: 1.5px solid #cbd5e1;
      border-radius: 20px;
      padding: 7px 15px;
      font-size: 14px;
      font-weight: 700;
      color: #475569;
      cursor: pointer;
      transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .chip-btn:hover {
      background: #e2e8f0;
      color: #0f172a;
    }

    .chip-btn.active {
      background: #2563eb;
      color: #ffffff;
      border-color: #2563eb;
      box-shadow: 0 2px 6px rgba(37, 99, 235, 0.3);
    }

    svg {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }

    .tick-label {
      font-size: 15px;
      font-weight: 700;
      fill: #64748b;
      text-anchor: middle;
      font-family: inherit;
    }

    .highlight-min,
    .highlight-max,
    .highlight-range,
    .highlight-dots {
      transition: opacity 0.3s ease;
    }

    .dimmed {
      opacity: 0.18;
    }

    @media (max-width: 400px) {
      .chip-btn {
        padding: 5px 10px;
        font-size: 12px;
      }
    }
  </style>
</head>
<body>

<div class="diagram-wrap">
  
  <div class="control-row">
    <button class="chip-btn active" onclick="setFocus('all')">Full Formula</button>
    <button class="chip-btn" onclick="setFocus('min')">Minimum (4)</button>
    <button class="chip-btn" onclick="setFocus('max')">Maximum (20)</button>
    <button class="chip-btn" onclick="setFocus('range')">Range (16)</button>
  </div>

  
  <svg viewBox="0 0 580 260" aria-label="Range calculation diagram on a number line">
    <defs>
      
      <marker id="arrow-start" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="6" markerHeight="6" orient="auto">
        <path d="M 9 1 L 2 5 L 9 9" fill="none" stroke="#2563eb" stroke-width="2.2" stroke-linecap="round" />
      </marker>
      <marker id="arrow-end" viewBox="0 0 10 10" refX="4" refY="5" markerWidth="6" markerHeight="6" orient="auto">
        <path d="M 1 1 L 8 5 L 1 9" fill="none" stroke="#2563eb" stroke-width="2.2" stroke-linecap="round" />
      </marker>
    </defs>

    
    <g id="grp-formula">
      <rect x="110" y="8" width="360" height="42" rx="21" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5" />
      <text x="290" y="35" text-anchor="middle" font-family="inherit" font-size="17" font-weight="800">
        <tspan fill="#475569">Range = </tspan>
        <tspan fill="#7c3aed" id="txt-max">20</tspan>
        <tspan fill="#475569"> − </tspan>
        <tspan fill="#0284c7" id="txt-min">4</tspan>
        <tspan fill="#475569"> = </tspan>
        <tspan fill="#2563eb" id="txt-res">16</tspan>
      </text>
    </g>

    
    
    <g id="grp-range" class="highlight-range">
      
      <rect x="130" y="62" width="320" height="98" rx="10" fill="#eff6ff" opacity="0.85" />

      
      <line x1="138" y1="90" x2="442" y2="90" stroke="#2563eb" stroke-width="2.5" marker-start="url(#arrow-start)" marker-end="url(#arrow-end)" />
      
      
      <rect x="185" y="72" width="210" height="36" rx="18" fill="#2563eb" />
      <text x="290" y="96" text-anchor="middle" fill="#ffffff" font-size="15" font-weight="700" font-family="inherit">
        Range = 20 − 4 = 16
      </text>

      
      <line x1="130" y1="92" x2="130" y2="160" stroke="#0284c7" stroke-width="2" stroke-dasharray="4 4" />
      <line x1="450" y1="92" x2="450" y2="160" stroke="#7c3aed" stroke-width="2" stroke-dasharray="4 4" />
    </g>

    
    
    <line x1="25" y1="160" x2="555" y2="160" stroke="#475569" stroke-width="3.5" stroke-linecap="round" />
    <path d="M 550 154 L 558 160 L 550 166" fill="none" stroke="#475569" stroke-width="3.5" stroke-linecap="round" stroke-linejoin="round" />
    <path d="M 30 154 L 22 160 L 30 166" fill="none" stroke="#475569" stroke-width="3.5" stroke-linecap="round" stroke-linejoin="round" />

    
    <line x1="90" y1="156" x2="90" y2="164" stroke="#94a3b8" stroke-width="1.5" />
    <line x1="170" y1="156" x2="170" y2="164" stroke="#94a3b8" stroke-width="1.5" />
    <line x1="250" y1="156" x2="250" y2="164" stroke="#94a3b8" stroke-width="1.5" />
    <line x1="330" y1="156" x2="330" y2="164" stroke="#94a3b8" stroke-width="1.5" />
    <line x1="410" y1="156" x2="410" y2="164" stroke="#94a3b8" stroke-width="1.5" />
    <line x1="490" y1="156" x2="490" y2="164" stroke="#94a3b8" stroke-width="1.5" />

    
    
    <line x1="50" y1="152" x2="50" y2="168" stroke="#64748b" stroke-width="2.5" stroke-linecap="round" />
    <text x="50" y="186" class="tick-label">0</text>

    
    <line x1="130" y1="150" x2="130" y2="170" stroke="#0284c7" stroke-width="3" stroke-linecap="round" />
    <text x="130" y="186" class="tick-label" fill="#0284c7" font-weight="800">4</text>

    
    <line x1="210" y1="152" x2="210" y2="168" stroke="#64748b" stroke-width="2.5" stroke-linecap="round" />
    <text x="210" y="186" class="tick-label">8</text>

    
    <line x1="290" y1="152" x2="290" y2="168" stroke="#64748b" stroke-width="2.5" stroke-linecap="round" />
    <text x="290" y="186" class="tick-label">12</text>

    
    <line x1="370" y1="152" x2="370" y2="168" stroke="#64748b" stroke-width="2.5" stroke-linecap="round" />
    <text x="370" y="186" class="tick-label">16</text>

    
    <line x1="450" y1="150" x2="450" y2="170" stroke="#7c3aed" stroke-width="3" stroke-linecap="round" />
    <text x="450" y="186" class="tick-label" fill="#7c3aed" font-weight="800">20</text>

    
    <line x1="530" y1="152" x2="530" y2="168" stroke="#64748b" stroke-width="2.5" stroke-linecap="round" />
    <text x="530" y="186" class="tick-label">24</text>

    
    <g id="grp-mid-dots" class="highlight-dots">
      <circle cx="190" cy="160" r="5" fill="#94a3b8" />
      <circle cx="250" cy="160" r="5" fill="#94a3b8" />
      <circle cx="290" cy="160" r="5" fill="#94a3b8" />
      <circle cx="350" cy="160" r="5" fill="#94a3b8" />
      <circle cx="410" cy="160" r="5" fill="#94a3b8" />
    </g>

    
    <g id="grp-min" class="highlight-min">
      
      <circle cx="130" cy="160" r="15" fill="#0284c7" opacity="0.25" />
      <circle cx="130" cy="160" r="8.5" fill="#0284c7" stroke="#ffffff" stroke-width="2.5" />
      
      
      <polygon points="130,200 123,208 137,208" fill="#0284c7" />
      <rect x="72" y="208" width="116" height="32" rx="8" fill="#e0f2fe" stroke="#0284c7" stroke-width="1.5" />
      <text x="130" y="230" text-anchor="middle" fill="#0369a1" font-size="14.5" font-weight="800" font-family="inherit">
        Minimum: 4
      </text>
    </g>

    
    <g id="grp-max" class="highlight-max">
      
      <circle cx="450" cy="160" r="15" fill="#7c3aed" opacity="0.25" />
      <circle cx="450" cy="160" r="8.5" fill="#7c3aed" stroke="#ffffff" stroke-width="2.5" />
      
      
      <polygon points="450,200 443,208 457,208" fill="#7c3aed" />
      <rect x="390" y="208" width="120" height="32" rx="8" fill="#f3e8ff" stroke="#7c3aed" stroke-width="1.5" />
      <text x="450" y="230" text-anchor="middle" fill="#6d28d9" font-size="14.5" font-weight="800" font-family="inherit">
        Maximum: 20
      </text>
    </g>
  </svg>
</div>

<script>
  function setFocus(type) {
    const btns = document.querySelectorAll('.chip-btn');
    btns.forEach(b => b.classList.remove('active'));
    
    if (type === 'all') btns[0].classList.add('active');
    if (type === 'min') btns[1].classList.add('active');
    if (type === 'max') btns[2].classList.add('active');
    if (type === 'range') btns[3].classList.add('active');

    const gMin = document.getElementById('grp-min');
    const gMax = document.getElementById('grp-max');
    const gRange = document.getElementById('grp-range');
    const gMid = document.getElementById('grp-mid-dots');

    gMin.classList.remove('dimmed');
    gMax.classList.remove('dimmed');
    gRange.classList.remove('dimmed');
    gMid.classList.remove('dimmed');

    if (type === 'min') {
      gMax.classList.add('dimmed');
      gRange.classList.add('dimmed');
      gMid.classList.add('dimmed');
    } else if (type === 'max') {
      gMin.classList.add('dimmed');
      gRange.classList.add('dimmed');
      gMid.classList.add('dimmed');
    } else if (type === 'range') {
      gMid.classList.add('dimmed');
    }
  }
</script>

</body>
</html>

Calculating and Interpreting the Range as Spread

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      user-select: none;
      -webkit-user-select: none;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #0f172a;
      background: transparent;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      min-height: 100%;
    }

    .header-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
    }

    .title {
      font-size: 14px;
      font-weight: 700;
      color: #0f172a;
      display: flex;
      align-items: center;
      gap: 6px;
      line-height: 1.2;
    }

    .controls {
      display: flex;
      gap: 6px;
      flex-shrink: 0;
    }

    .btn {
      padding: 5px 10px;
      font-size: 12px;
      font-weight: 600;
      border-radius: 6px;
      border: 1px solid #cbd5e1;
      background: #ffffff;
      color: #334155;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: background 0.15s, border-color 0.15s, opacity 0.15s;
    }

    .btn:hover {
      background: #f8fafc;
      border-color: #94a3b8;
    }

    .btn:active {
      opacity: 0.85;
    }

    .btn-primary {
      background: #0f172a;
      color: #ffffff;
      border-color: #0f172a;
    }

    .btn-primary:hover {
      background: #1e293b;
      border-color: #1e293b;
    }

    /* Diagram Area */
    .timeline-container {
      position: relative;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 12px 14px 8px 14px;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    /* Grid overlay */
    .grid-lines {
      position: absolute;
      top: 10px;
      bottom: 26px;
      left: 14px;
      right: 14px;
      pointer-events: none;
    }

    .grid-line {
      position: absolute;
      top: 0;
      bottom: 0;
      width: 1px;
      background: #f1f5f9;
      transform: translateX(-50%);
    }

    /* Service Row */
    .service-row {
      position: relative;
      z-index: 1;
      display: flex;
      flex-direction: column;
      gap: 5px;
    }

    .service-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 4px 8px;
      font-size: 12px;
    }

    .service-title-group {
      display: flex;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
    }

    .service-name {
      font-weight: 700;
      color: #0f172a;
      font-size: 13px;
    }

    .badge {
      font-size: 10.5px;
      font-weight: 600;
      padding: 2px 7px;
      border-radius: 12px;
      white-space: nowrap;
    }

    .badge-green {
      background: #ecfdf5;
      color: #047857;
      border: 1px solid #a7f3d0;
    }

    .badge-amber {
      background: #fffbeb;
      color: #b45309;
      border: 1px solid #fde68a;
    }

    .calc-pill {
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
      font-weight: 700;
      font-size: 10.5px;
      padding: 2px 6px;
      border-radius: 4px;
      background: #f1f5f9;
      white-space: nowrap;
    }

    .track {
      position: relative;
      height: 36px;
      background: #f8fafc;
      border-radius: 6px;
      border: 1px solid #e2e8f0;
      overflow: visible;
    }

    .range-bar {
      position: absolute;
      top: 5px;
      bottom: 5px;
      border-radius: 5px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: clamp(9px, 2.4vw, 11px);
      font-weight: 700;
      letter-spacing: -0.2px;
      white-space: nowrap;
      padding: 0 4px;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
      text-shadow: 0 1px 1px rgba(0, 0, 0, 0.15);
      overflow: visible;
    }

    .range-bar-green {
      background: #059669;
      color: #ffffff;
    }

    .range-bar-amber {
      background: #d97706;
      color: #ffffff;
    }

    /* Animated Delivery Pins */
    .delivery-pin {
      position: absolute;
      top: 6px;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: #0f172a;
      color: #ffffff;
      font-size: 10px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      transform: translateX(-50%) translateY(-14px) scale(0.4);
      opacity: 0;
      transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.25s ease;
      z-index: 5;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.25);
      border: 2px solid #ffffff;
    }

    .delivery-pin.visible {
      transform: translateX(-50%) translateY(0) scale(1);
      opacity: 1;
    }

    /* Shared Axis */
    .axis-container {
      position: relative;
      height: 22px;
      margin-top: 2px;
      z-index: 2;
    }

    .axis-line {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: #94a3b8;
    }

    .axis-tick {
      position: absolute;
      top: 0;
      transform: translateX(-50%);
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .tick-mark {
      width: 1px;
      height: 5px;
      background: #64748b;
    }

    .tick-label {
      margin-top: 2px;
      font-size: 10px;
      font-weight: 600;
      color: #64748b;
    }

    /* Dynamic Insight Callout */
    .insight-panel {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 8px 12px;
      font-size: 12px;
      line-height: 1.4;
      color: #334155;
    }

    @media (max-width: 420px) {
      body {
        padding: 8px;
        gap: 8px;
      }
      .title {
        font-size: 13px;
      }
      .service-header {
        gap: 2px 6px;
      }
      .service-name {
        font-size: 12px;
      }
      .badge, .calc-pill {
        font-size: 9.5px;
        padding: 1px 5px;
      }
      .btn {
        padding: 4px 8px;
        font-size: 11px;
      }
      .insight-panel {
        font-size: 11px;
        padding: 6px 10px;
      }
    }
  </style>
</head>
<body>

  <div class="header-row">
    <div class="title">
      <span>⏱️ Range: Consistency vs. Variability</span>
    </div>
    <div class="controls">
      <button class="btn btn-primary" id="simBtn" onclick="simulateDeliveries()">🎲 Simulate 5</button>
      <button class="btn" id="resetBtn" onclick="resetSimulation()">Reset</button>
    </div>
  </div>

  <div class="timeline-container">
    
    <div class="grid-lines">
      <div class="grid-line" style="left: 0%;"></div>
      <div class="grid-line" style="left: 14.285%;"></div>
      <div class="grid-line" style="left: 28.571%;"></div>
      <div class="grid-line" style="left: 42.857%;"></div>
      <div class="grid-line" style="left: 57.142%;"></div>
      <div class="grid-line" style="left: 71.428%;"></div>
      <div class="grid-line" style="left: 85.714%;"></div>
      <div class="grid-line" style="left: 100%;"></div>
    </div>

    
    <div class="service-row">
      <div class="service-header">
        <div class="service-title-group">
          <span class="service-name">🚐 Reliable Vans</span>
          <span class="badge badge-green">Small Range = Consistent</span>
        </div>
        <span class="calc-pill" style="color: #047857;">35 − 25 = 10 min</span>
      </div>
      <div class="track" id="track1">
        
        <div class="range-bar range-bar-green" style="left: 35.714%; width: 14.286%;">
          <span>25–35 min</span>
        </div>
      </div>
    </div>

    
    <div class="service-row">
      <div class="service-header">
        <div class="service-title-group">
          <span class="service-name">⚡ Speedy Express</span>
          <span class="badge badge-amber">Large Range = Variable</span>
        </div>
        <span class="calc-pill" style="color: #b45309;">60 − 10 = 50 min</span>
      </div>
      <div class="track" id="track2">
        
        <div class="range-bar range-bar-amber" style="left: 14.286%; width: 71.428%;">
          <span>10–60 min (Range = 50 min)</span>
        </div>
      </div>
    </div>

    
    <div class="axis-container">
      <div class="axis-line"></div>
      <div class="axis-tick" style="left: 0%;"><div class="tick-mark"></div><div class="tick-label">0m</div></div>
      <div class="axis-tick" style="left: 14.285%;"><div class="tick-mark"></div><div class="tick-label">10m</div></div>
      <div class="axis-tick" style="left: 28.571%;"><div class="tick-mark"></div><div class="tick-label">20m</div></div>
      <div class="axis-tick" style="left: 42.857%;"><div class="tick-mark"></div><div class="tick-label">30m</div></div>
      <div class="axis-tick" style="left: 57.142%;"><div class="tick-mark"></div><div class="tick-label">40m</div></div>
      <div class="axis-tick" style="left: 71.428%;"><div class="tick-mark"></div><div class="tick-label">50m</div></div>
      <div class="axis-tick" style="left: 85.714%;"><div class="tick-mark"></div><div class="tick-label">60m</div></div>
      <div class="axis-tick" style="left: 100%;"><div class="tick-mark"></div><div class="tick-label">70m</div></div>
    </div>
  </div>

  
  <div class="insight-panel" id="insightBanner">
    💡 <strong>Key Takeaway:</strong> A smaller range means data clusters tightly (consistent). A larger range means data spreads widely (variable).
  </div>

  <script>
    function minToPercent(mins) {
      return (mins / 70) * 100;
    }

    function clearMarkers() {
      document.querySelectorAll('.delivery-pin').forEach(el => el.remove());
    }

    function resetSimulation() {
      clearMarkers();
      document.getElementById('insightBanner').innerHTML =
        `💡 <strong>Key Takeaway:</strong> A smaller range means data clusters tightly (consistent). A larger range means data spreads widely (variable).`;
    }

    function simulateDeliveries() {
      clearMarkers();

      const track1 = document.getElementById('track1');
      const track2 = document.getElementById('track2');

      const reliablePoints = [];
      const speedyPoints = [];

      for (let i = 0; i < 5; i++) {
        // Reliable: strictly clustered 25 to 35 min
        reliablePoints.push(25.5 + Math.random() * 9);
        // Speedy: spread widely 10 to 60 min
        speedyPoints.push(11 + Math.random() * 48);
      }

      // Sort values slightly so pin indices make visual sense left-to-right
      reliablePoints.sort((a, b) => a - b);
      speedyPoints.sort((a, b) => a - b);

      reliablePoints.forEach((val, idx) => {
        const marker = document.createElement('div');
        marker.className = 'delivery-pin';
        marker.textContent = idx + 1;
        marker.style.left = minToPercent(val) + '%';
        track1.appendChild(marker);
        setTimeout(() => marker.classList.add('visible'), idx * 70 + 30);
      });

      speedyPoints.forEach((val, idx) => {
        const marker = document.createElement('div');
        marker.className = 'delivery-pin';
        marker.textContent = idx + 1;
        marker.style.left = minToPercent(val) + '%';
        track2.appendChild(marker);
        setTimeout(() => marker.classList.add('visible'), idx * 70 + 30);
      });

      document.getElementById('insightBanner').innerHTML =
        `🎯 <strong>Observed:</strong> 🚐 <strong>Reliable</strong> clusters within a 10m window (predictable), while ⚡ <strong>Speedy</strong> fluctuates across 50m (unpredictable).`;
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #f8fafc;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 16px;
      user-select: none;
    }
    .toggle-bar {
      display: flex;
      background: #e2e8f0;
      padding: 4px;
      border-radius: 9999px;
      margin-bottom: 16px;
      gap: 4px;
    }
    .btn {
      border: none;
      background: transparent;
      padding: 8px 18px;
      border-radius: 9999px;
      font-size: 14px;
      font-weight: 600;
      color: #64748b;
      cursor: pointer;
      transition: all 0.25s ease;
    }
    .btn.active {
      background: #ffffff;
      color: #0f172a;
      box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    }
    .svg-container {
      width: 100%;
      max-width: 580px;
    }
    svg {
      width: 100%;
      height: auto;
      overflow: visible;
    }
    .range-bar {
      transition: x 0.4s ease, width 0.4s ease, fill 0.4s ease;
    }
    .range-bracket {
      transition: d 0.4s ease, stroke 0.4s ease;
    }
    .outlier-group {
      transition: opacity 0.4s ease, transform 0.4s ease;
      transform-origin: 130px 145px;
    }
    .outlier-group.dimmed {
      opacity: 0.15;
    }
    .val-text {
      font-size: 18px;
      font-weight: 700;
      text-anchor: middle;
      transition: fill 0.4s ease;
    }
  </style>
</head>
<body>

  <div class="toggle-bar">
    <button id="btnWith" class="btn active" onclick="setOutlier(true)">With Outlier</button>
    <button id="btnWithout" class="btn" onclick="setOutlier(false)">Outlier Removed</button>
  </div>

  <div class="svg-container">
    <svg viewBox="0 0 560 230">
      
      <line x1="30" y1="160" x2="530" y2="160" stroke="#cbd5e1" stroke-width="2" stroke-linecap="round" />

      
      
      <g stroke="#94a3b8" stroke-width="1.5">
        <line x1="30" y1="160" x2="30" y2="168" />
        <line x1="130" y1="160" x2="130" y2="168" />
        <line x1="230" y1="160" x2="230" y2="168" />
        <line x1="330" y1="160" x2="330" y2="168" />
        <line x1="430" y1="160" x2="430" y2="168" />
        <line x1="530" y1="160" x2="530" y2="168" />
      </g>
      <g fill="#64748b" font-size="12" text-anchor="middle">
        <text x="30" y="184">0</text>
        <text x="130" y="184">20</text>
        <text x="230" y="184">40</text>
        <text x="330" y="184">60</text>
        <text x="430" y="184">80</text>
        <text x="530" y="184">100</text>
      </g>

      
      <rect id="rangeBg" class="range-bar" x="130" y="70" width="375" height="42" rx="8" fill="#fee2e2" />
      
      
      <path id="rangePath" class="range-bracket" d="M 130 116 L 130 124 L 505 124 L 505 116" fill="none" stroke="#ef4444" stroke-width="2.5" stroke-linejoin="round" />

      
      <text id="rangeLabel" class="val-text" x="317.5" y="97" fill="#dc2626">
        Range = 95 − 20 = 75
      </text>

      
      <g id="outlierDot" class="outlier-group">
        <circle cx="130" cy="145" r="10" fill="#ef4444" />
        <text x="130" y="132" fill="#ef4444" font-size="12" font-weight="700" text-anchor="middle">20</text>
      </g>

      
      
      <g fill="#0284c7">
        <circle cx="470" cy="145" r="7.5" />
        <circle cx="480" cy="145" r="7.5" />
        <circle cx="485" cy="145" r="7.5" />
        <circle cx="490" cy="145" r="7.5" />
        <circle cx="505" cy="145" r="7.5" />
      </g>
      
      
      <text x="470" y="132" fill="#0284c7" font-size="11" font-weight="600" text-anchor="middle">88</text>
      <text x="505" y="132" fill="#0284c7" font-size="11" font-weight="600" text-anchor="middle">95</text>
    </svg>
  </div>

  <script>
    function setOutlier(hasOutlier) {
      const btnWith = document.getElementById('btnWith');
      const btnWithout = document.getElementById('btnWithout');
      const outlierDot = document.getElementById('outlierDot');
      const rangeBg = document.getElementById('rangeBg');
      const rangePath = document.getElementById('rangePath');
      const rangeLabel = document.getElementById('rangeLabel');

      if (hasOutlier) {
        btnWith.classList.add('active');
        btnWithout.classList.remove('active');
        outlierDot.classList.remove('dimmed');

        rangeBg.setAttribute('x', '130');
        rangeBg.setAttribute('width', '375');
        rangeBg.setAttribute('fill', '#fee2e2');

        rangePath.setAttribute('d', 'M 130 116 L 130 124 L 505 124 L 505 116');
        rangePath.setAttribute('stroke', '#ef4444');

        rangeLabel.setAttribute('x', '317.5');
        rangeLabel.setAttribute('fill', '#dc2626');
        rangeLabel.textContent = 'Range = 95 − 20 = 75';
      } else {
        btnWithout.classList.add('active');
        btnWith.classList.remove('active');
        outlierDot.classList.add('dimmed');

        rangeBg.setAttribute('x', '455');
        rangeBg.setAttribute('width', '65');
        rangeBg.setAttribute('fill', '#e0f2fe');

        rangePath.setAttribute('d', 'M 470 116 L 470 124 L 505 124 L 505 116');
        rangePath.setAttribute('stroke', '#0284c7');

        rangeLabel.setAttribute('x', '487.5');
        rangeLabel.setAttribute('fill', '#0284c7');
        rangeLabel.textContent = '95 − 88 = 7';
      }
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
      user-select: none;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: transparent;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 10px 12px;
      gap: 8px;
    }

    .top-bar {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
    }

    .header-text {
      display: flex;
      flex-direction: column;
    }

    .title {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
      line-height: 1.2;
    }

    .subtitle {
      font-size: 12px;
      color: #64748b;
      font-weight: 500;
    }

    /* Segmented Control */
    .toggle-group {
      display: inline-flex;
      background: #e2e8f0;
      padding: 2px;
      border-radius: 8px;
      flex-shrink: 0;
    }

    .toggle-btn {
      border: none;
      background: transparent;
      padding: 5px 10px;
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
      border-radius: 6px;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .toggle-btn.active {
      background: #ffffff;
      color: #0f172a;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    }

    /* Plot Cards */
    .plots-container {
      width: 100%;
      display: flex;
      flex-direction: column;
      gap: 8px;
      flex: 1;
      justify-content: center;
    }

    .plot-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 8px 12px 6px;
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .card-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
      font-weight: 700;
    }

    .player-a-head { color: #0284c7; }
    .player-b-head { color: #ea580c; }

    .range-pill {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 12px;
      opacity: 0;
      transform: translateY(2px);
      transition: opacity 0.25s ease, transform 0.25s ease;
    }

    .pill-a {
      background: #e0f2fe;
      color: #0369a1;
      border: 1px solid #bae6fd;
    }

    .pill-b {
      background: #ffedd5;
      color: #c2410c;
      border: 1px solid #fed7aa;
    }

    .show-spread .range-pill {
      opacity: 1;
      transform: translateY(0);
    }

    .svg-wrap {
      width: 100%;
      height: auto;
    }

    svg {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }

    /* SVG Styles */
    .axis-line { stroke: #cbd5e1; stroke-width: 1.5; }
    .tick-line { stroke: #94a3b8; stroke-width: 1.2; }
    .tick-text { font-size: 11px; fill: #64748b; font-weight: 500; font-family: system-ui, sans-serif; text-anchor: middle; }
    
    .mean-line {
      stroke: #8b5cf6;
      stroke-width: 1.5;
      stroke-dasharray: 4 3;
    }

    .mean-label {
      font-size: 10px;
      font-weight: 700;
      fill: #7c3aed;
      text-anchor: middle;
      font-family: system-ui, sans-serif;
    }

    .data-point-circle {
      transition: transform 0.2s ease, fill 0.2s ease;
      cursor: pointer;
    }

    .data-point-circle:hover {
      filter: brightness(0.9);
    }

    .pts-a { fill: #0284c7; }
    .pts-b { fill: #ea580c; }

    /* Spread Visual Elements */
    .spread-layer {
      opacity: 0;
      transform: translateY(3px);
      transition: opacity 0.3s ease, transform 0.3s ease;
      pointer-events: none;
    }

    .show-spread .spread-layer {
      opacity: 1;
      transform: translateY(0);
    }

    .spread-band-a { fill: rgba(2, 132, 199, 0.12); }
    .spread-band-b { fill: rgba(234, 88, 12, 0.12); }
    .bracket-a { stroke: #0284c7; stroke-width: 2; fill: none; }
    .bracket-b { stroke: #ea580c; stroke-width: 2; fill: none; }
    .spread-text-a { fill: #0369a1; font-size: 10.5px; font-weight: 700; text-anchor: middle; font-family: system-ui, sans-serif; }
    .spread-text-b { fill: #c2410c; font-size: 10.5px; font-weight: 700; text-anchor: middle; font-family: system-ui, sans-serif; }
  </style>
</head>
<body>

  
  <div class="top-bar">
    <div class="header-text">
      <div class="title">Comparing Variability</div>
      <div class="subtitle">Both datasets have Mean = 15</div>
    </div>
    <div class="toggle-group" role="tablist">
      <button class="toggle-btn active" id="btnRaw" onclick="setMode('raw')">Data</button>
      <button class="toggle-btn" id="btnSpread" onclick="setMode('spread')">Show Spread</button>
    </div>
  </div>

  <div class="plots-container" id="plotsContainer">
    
    
    <div class="plot-card">
      <div class="card-head player-a-head">
        <span>Player A (Consistent)</span>
        <span class="range-pill pill-a">Range = 16 − 14 = 2</span>
      </div>
      <div class="svg-wrap">
        <svg viewBox="0 0 540 86">
          
          <g class="spread-layer">
            <rect class="spread-band-a" x="255" y="10" width="30" height="52" rx="4" />
            <path class="bracket-a" d="M 255,70 L 255,75 L 285,75 L 285,70" />
            <text class="spread-text-a" x="270" y="85">Spread = 2</text>
          </g>

          
          <line class="mean-line" x1="270" y1="12" x2="270" y2="62" />
          <text class="mean-label" x="270" y="9">Mean = 15</text>

          
          <line class="axis-line" x1="45" y1="62" x2="495" y2="62" />

          
          
          <line class="tick-line" x1="45" y1="62" x2="45" y2="66" /><text class="tick-text" x="45" y="76">0</text>
          <line class="tick-line" x1="120" y1="62" x2="120" y2="66" /><text class="tick-text" x="120" y="76">5</text>
          <line class="tick-line" x1="195" y1="62" x2="195" y2="66" /><text class="tick-text" x="195" y="76">10</text>
          <line class="tick-line" x1="270" y1="62" x2="270" y2="66" /><text class="tick-text" x="270" y="76">15</text>
          <line class="tick-line" x1="345" y1="62" x2="345" y2="66" /><text class="tick-text" x="345" y="76">20</text>
          <line class="tick-line" x1="420" y1="62" x2="420" y2="66" /><text class="tick-text" x="420" y="76">25</text>
          <line class="tick-line" x1="495" y1="62" x2="495" y2="66" /><text class="tick-text" x="495" y="76">30</text>

          
          
          <circle class="data-point-circle pts-a" cx="255" cy="54" r="5" />
          <circle class="data-point-circle pts-a" cx="255" cy="41" r="5" />
          
          <circle class="data-point-circle pts-a" cx="270" cy="54" r="5" />
          <circle class="data-point-circle pts-a" cx="270" cy="41" r="5" />
          <circle class="data-point-circle pts-a" cx="270" cy="28" r="5" />
          
          <circle class="data-point-circle pts-a" cx="285" cy="54" r="5" />
          <circle class="data-point-circle pts-a" cx="285" cy="41" r="5" />
        </svg>
      </div>
    </div>

    
    <div class="plot-card">
      <div class="card-head player-b-head">
        <span>Player B (Spread Out)</span>
        <span class="range-pill pill-b">Range = 28 − 2 = 26</span>
      </div>
      <div class="svg-wrap">
        <svg viewBox="0 0 540 86">
          
          <g class="spread-layer">
            <rect class="spread-band-b" x="75" y="10" width="390" height="52" rx="4" />
            <path class="bracket-b" d="M 75,70 L 75,75 L 465,75 L 465,70" />
            <text class="spread-text-b" x="270" y="85">Spread = 26</text>
          </g>

          
          <line class="mean-line" x1="270" y1="12" x2="270" y2="62" />
          <text class="mean-label" x="270" y="9">Mean = 15</text>

          
          <line class="axis-line" x1="45" y1="62" x2="495" y2="62" />

          
          <line class="tick-line" x1="45" y1="62" x2="45" y2="66" /><text class="tick-text" x="45" y="76">0</text>
          <line class="tick-line" x1="120" y1="62" x2="120" y2="66" /><text class="tick-text" x="120" y="76">5</text>
          <line class="tick-line" x1="195" y1="62" x2="195" y2="66" /><text class="tick-text" x="195" y="76">10</text>
          <line class="tick-line" x1="270" y1="62" x2="270" y2="66" /><text class="tick-text" x="270" y="76">15</text>
          <line class="tick-line" x1="345" y1="62" x2="345" y2="66" /><text class="tick-text" x="345" y="76">20</text>
          <line class="tick-line" x1="420" y1="62" x2="420" y2="66" /><text class="tick-text" x="420" y="76">25</text>
          <line class="tick-line" x1="495" y1="62" x2="495" y2="66" /><text class="tick-text" x="495" y="76">30</text>

          
          
          <circle class="data-point-circle pts-b" cx="75" cy="54" r="5" />
          
          <circle class="data-point-circle pts-b" cx="135" cy="54" r="5" />
          
          <circle class="data-point-circle pts-b" cx="270" cy="54" r="5" />
          
          <circle class="data-point-circle pts-b" cx="405" cy="54" r="5" />
          
          <circle class="data-point-circle pts-b" cx="465" cy="54" r="5" />
        </svg>
      </div>
    </div>

  </div>

  <script>
    function setMode(mode) {
      const container = document.getElementById('plotsContainer');
      const btnRaw = document.getElementById('btnRaw');
      const btnSpread = document.getElementById('btnSpread');

      if (mode === 'spread') {
        container.classList.add('show-spread');
        btnSpread.classList.add('active');
        btnRaw.classList.remove('active');
      } else {
        container.classList.remove('show-spread');
        btnRaw.classList.add('active');
        btnSpread.classList.remove('active');
      }
    }
  </script>
</body>
</html>

OGM.6.DA.3

Aligned learning resources

Related diagrams