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Gmat Prep - Standard deviation

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by pepeprepa » Mon Aug 25, 2008 4:22 am
SD=0.3
1.5*0.3=0.45

within 1.5 around the means, so it muse be between
8.1-0.45=7.65 and 8.1+0.45=8.55
There is only one which is not in this interval
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