IQ scores are collected from a sample of students at a large university. The scores are shown. 99, 100, 105, 104, 102, 105, 105, 121, 104 What is the mean IQ for this sample?

Add the nine IQ scores: 99 + 100 + 105 + 104 + 102 + 105 + 105 + 121 + 104 = 945. Divide the total by 9, the number of scores: 945 ÷ 9 = 105. The mean IQ is 105, choice C.

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