Question 7 • Concepts in Probability and Statistics A
Before the missed test, the scores in order are 82, 90, 91, 96, and 100, so the middle score—and median—is 91. Their sum is 459, and 459 ÷ 5 = 91.8, so the mean is 91.8. Adding a zero lowers the mean, so the mean is affected. Because zero is far below the other scores, the median is the more appropriate measure of center after it is added.
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