Polina’s math scores are shown in the table.Polina’s Math ScoresMath Scores7265758890What 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. So the mean absolute deviation is 8.8, choice D.

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