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GMAT Prep- Standard Deviation Problem

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GMAT Prep- Standard Deviation Problem [#permalink] New post 20 Jun 2008, 20:19
Can some one explain the below problem? Thanks!
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Re: GMAT Prep- Standard Deviation Problem [#permalink] New post 20 Jun 2008, 20:46
Mean = 21
Sd = 6

1 Sd below the mean is 21-6 = 15
2 Sd below the mean is 21-12 = 9

So the only choice is 12 between 15 and 9
Re: GMAT Prep- Standard Deviation Problem   [#permalink] 20 Jun 2008, 20:46
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GMAT Prep- Standard Deviation Problem

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