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Re: standard deviation is so mean [#permalink]
04 Dec 2009, 05:08
mean = 10 and SD = 0.3
we need to find numbers which are within 1 standard deviation of the mean which will be total numbers in range of 10 +/- 0.3 i.e. in the range of 9.7 to 10.3 both inclusive. we can see all numbers except 9.4 and 10.5 fall in this range. So percent is (6/8) *100 = 75%