I don't know how to answer this question.
If a certain sample of data has a mean of 20.0 and a standard deivation of 3.0, which of the following values is more than 2.5 standard deviation from the mean?
a. 12.0
b. 13.5
c. 17.0
d. 23.5
e. 26.5
Thanks a lot , please answer this question as detailed as possible.
If a certain sample of data has a mean of 20.0 and a standard deivation of 3.0, which of the following values is more than 2.5 standard deviation from the mean?
题意:某个数据样本平均数为20,标准差是3.0,下面哪个值大于平均数+2.5标准差?
因此此数大于20+2.5*3=27.5?数字选项给错了吧?
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