To find the mean weight of the 33 apples, we can first find the total weight of all the apples and then divide by the total number of apples.
Total weight of 16 apples = 16 * 115 = 1840 grams
Total weight of 17 apples = 17 * 91 = 1547 grams
Total weight of 33 apples = 1840 + 1547 = 3387 grams
Mean weight of 33 apples = Total weight / Total number of apples = 3387 / 33 = 102.64 grams
So, the mean weight of the 33 apples is 102.64 grams.