这道题什么意思？求助

Aviva0307 · 发表于 2010-12-22 19:08:08

9. The class mean score on a test was 60, and the standard deviation was 15. If Elena's
score was within 2 standard deviations of the mean, what is the lowest score she
could have received?

想知道Elena's score was within 2 standard deviations of the mean翻译成汉语是什么意思？谢谢~~~~

fangpyj8906 · 发表于 2010-12-22 19:19:53

班级平均分是60，离差是15（也就是在60分上下波动的范围是15），E的得分在平均分的两个离差内，问E最低得分是多少
60-15*2=30

Aviva0307 · 发表于 2010-12-22 20:36:50

哦~~~got it！

这道题什么意思？求助

所属分类: GMAT考试

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