Polina’s math scores are shown in the table. Polina’s Math Scores Math Scores 72 65 75 88 90 What is the mean absolute deviation of her math scores?

First find the mean: (72 + 65 + 75 + 88 + 90) ÷ 5 = 78. The absolute deviations from 78 are 6, 13, 3, 10, and 12; their mean is (6 + 13 + 3 + 10 + 12) ÷ 5 = 8.8. The mean absolute deviation is 8.8, choice C.

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