Question 9 • Concepts in Probability and Statistics A
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 median is 90. The score of 10 is much lower than the others and pulls the mean down, so the median best represents the data. The correct choice is B, the median.
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