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
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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