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by cans » Thu Jun 09, 2011 8:22 am
mean=21
s.d=6
value 1 s.d below the mean = mean-s.d = 21-6 = 15
value 2 s.d below the mean = mean-2*s.d = 21-2*6 = 9
Thus value should be between 9 and 15
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