If a certain sample of data has a mean of 20.0 and astandard deviation of 3.0, which of the following values is more than 2.5 standard deviations from the mean?
12.0
13.5
17.0
23.5
26.5
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【Standard deviation and Mean 类型题】 mean=20,standard deviation =3 [20-2.5*3,20+2.5*3]--->[12.5,27.5], 求超出这个范围的，只有A
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【Standard deviation and Mean 类型题】
mean=20,standard deviation =3
[20-2.5*3,20+2.5*3]--->[12.5,27.5], 求超出这个范围的，只有A
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