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Mordecai · 2017年07月08日

问一道题:NO.PZ2015120604000178

问题如下图:

    

选项:

A.

B.

C.

解释:


为什么要把12%chu'yi除以根号五,这是标准差求其平均数的方式吗?

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已采纳答案

源_品职助教 · 2017年07月08日


Mordecai · 2017年07月10日

并不是刷题……而是做题的时候出现了下一个reading的题 没听过的知识点就下意识的问了……

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