GRE数学(Barron模考)每日一题 第37期
日期:2014-10-28 09:09(单词翻译:单击)
GRE数学试题
If a certain sample of data has a mean of 20.0 and a standard deviation of 3.0, which of the following values are more than 2.5 standard deviations from the mean?
A.12.0
B.13.5
C.17.0
D.23.5
E.28.5
参考答案
标准差是3,那么2.5个标准差7.5,则20+—7.5以外的数据就是答案了
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