GMATPREP Standard Deviation

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cveluswamy: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Tue Mar 20, 2007 6:02 am

by cveluswamy » Sat Aug 04, 2007 12:03 pm

Can some one explain this. Thanks

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Source: Beat The GMAT — Problem Solving | Sat Aug 04, 2007 12:03 pm

jayhawk2001: Community Manager; Posts: 789; Joined: Sun Jan 28, 2007 3:51 pm; Location: Silicon valley, California; Thanked: 30 times; Followed by:1 members

by jayhawk2001 » Sat Aug 04, 2007 3:04 pm

2.5 standard deviations = 2.5 * 3 = 7.5

2.5 standard deviations from the mean is either < 12.5 or > 27.5

Only 12 fits the bill

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