回复：请教,这题目是啥意思阿...

来源: davidmpang 于 2009-12-15 21:39:00 [] [旧帖] [给我悄悄话] 阅读数 : (220 bytes)

the answer should be D.

The question ask if 5 is added to each score.
The new mean will be old mean+5, also the new median with 5 more the old.The standard deviation will be the same.

Hope it is helpful!

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