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we can divide the Normal bell cuve in terms of +3Sigma & -3 sigma.Ramit88 wrote:f a certain sample of data has a mean of 20 and a standard deviation of 3, which of the following values is more than 2.5 standard deviations from the mean?
A. 12.0
B. 13.5
C. 17.0
D. 23.5
E. 26.5
ANS A
it says more than so should not it be 20 + 7.5 = 27.5
Here more than doesn't mean more in terms of numerical value but more in terms of distance.Ramit88 wrote:f a certain sample of data has a mean of 20 and a standard deviation of 3, which of the following values is more than 2.5 standard deviations from the mean?
A. 12.0
B. 13.5
C. 17.0
D. 23.5
E. 26.5
it says more than so should not it be 20 + 7.5 = 27.5
