請教,這題目是啥意思阿...

來源: 於 2009-12-06 11:24:45 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

在準備ＧＭＡＴ考試,看到這題目,根本沒看懂題目的意思,請高手幫忙看下:

A researcher computed the mean,the median,and the standard deviation for aset 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