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GMAT PREP PS - MEAN and SD

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GMAT PREP PS - MEAN and SD

by rveeraga » Mon Nov 23, 2009 9:42 pm
If a certain sample of data has a mean of 20 and standard deviation of 3, which of the following values is more than 2.5 standard deviations from the mean?

a. 12
b. 13.5
c. 17
d. 23.5
e. 26.5

answer is a. 12

Can some one shed light on, how to get the answer?

Thanks.
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by satish.nagdev » Mon Nov 23, 2009 10:28 pm
clear explanation given here https://www.manhattangmat.com/forums/if- ... t4559.html

Thanks Ron Purewal
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