A researcher computed the mean, the median, and the standard deviation for a set of performance scores. If 5 were to be added to each score, which of these three statistics would change?

A、The mean only
B、The median only
C、The standard deviation only
D、The mean and the median
E、The mean and the standard deviation

答案：D

专业教师答疑

问题：老师，我这题看不懂，我以为他说那一条线段分为5分或者7份然后找最小差值，所以选了C，请May老师解答一下

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扫我提问哦！