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GMAT PREP PS - MEAN and SD

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rveeraga: Senior | Next Rank: 100 Posts; Posts: 42; Joined: Fri Jul 03, 2009 9:52 am; Location: San Jose, CA; Thanked: 2 times

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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Source: Beat The GMAT — Problem Solving | Mon Nov 23, 2009 9:42 pm

satish.nagdev: Master | Next Rank: 500 Posts; Posts: 130; Joined: Sat Dec 29, 2007 5:35 am; Location: SGP; Thanked: 5 times

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

Wounded by GMAT but not dead

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