Alicia received the following seven scores on her math assignments. 80, 90, 10, 75, 90, 95, 99 Find the mean and median. Which measure of center best represents the data?

The mean is (80 + 90 + 10 + 75 + 90 + 95 + 99) ÷ 7 = 539 ÷ 7 = 77. In order, the scores are 10, 75, 80, 90, 90, 95, 99, so the middle score—and the median—is 90. The unusually low score of 10 pulls the mean down, so the median better represents the typical score. The correct choice is A, the median.

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