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Arithmetic mean and standard deviation of a certain normal

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Manager
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Arithmetic mean and standard deviation of a certain normal [#permalink] New post 02 Nov 2010, 04:32
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Difficulty:

  25% (low)

Question Stats:

86% (01:17) correct 13% (00:41) wrong based on 23 sessions
Arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5. 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

Last edited by Bunuel on 19 Feb 2012, 21:25, edited 1 time in total.
Edited the question
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Re: the arthimetic and standard deviation [#permalink] New post 02 Nov 2010, 04:49
Expert's post
Original question is:

Arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5. 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 below the mean is: mean-2*SD=13.5-2*1.5=10.5.

Answer: A.
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Manager
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Re: the arthimetic and standard deviation [#permalink] New post 02 Nov 2010, 13:32
Is this question really a 600-700 level?
What is the source?
Thanks
Re: the arthimetic and standard deviation   [#permalink] 02 Nov 2010, 13:32
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