谁能解释一下这一道Statistics题目，看不懂啊

KatherineWoo · 发表于 2011-11-14 22:58:13

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

who can explain whats the meaning of MEAN, MEDIAN, STANDARD DEVIATION, i can not understand....Thanks.

Miyari · 发表于 2011-11-15 00:32:30

选D，mean和median都增加5，standard deviation不变。
Mean是平均数，median是中位数，standard deviation是标准差。

KatherineWoo · 发表于 2011-11-16 13:38:45

多谢，总算搞懂这道题了。

谁能解释一下这一道Statistics题目，看不懂啊

所属分类: GMAT考试

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