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Standard Deviation Problem

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by leonswati » Tue May 01, 2012 9:04 am
Mean= 1000/10 = 100
S.D= 22.4
one SD below mean is 100-22.4 = 77.6

So there are only 2 values satisfying 70 and 75

Note if the question says away from mean instead of below mean then we should also consider values > 100 + 22.4
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