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The arithmetic mean and standard deviation of a certain

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The arithmetic mean and standard deviation of a certain [#permalink]

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New post 15 Mar 2012, 07:29
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The arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5, respectively. What value is exactly 2 standard deviations less than the mean?

A. 10.5
B. 11
C. 11.5
D. 12
E. 12.5
[Reveal] Spoiler: OA
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Re: The arithmetic mean and standard deviation of a certain [#permalink]

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New post 15 Mar 2012, 07:35
MaithiliGokarn wrote:
The arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5, respectively. What value is exactly 2 standard deviations less than the mean?
a) 10.5
b) 11
c) 11.5
d) 12
e) 12.5

:|


The value which is exactly two SD less than the mean is: mean-2*SD=13.5-2*1.5=10.5.

Answer: A.

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Re: The arithmetic mean and standard deviation of a certain   [#permalink] 15 Mar 2012, 07:35
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