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Arithmetic mean and standard deviation of a certain normal

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Arithmetic mean and standard deviation of a certain normal  [#permalink]

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New post Updated on: 19 Feb 2012, 22:25
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92% (00:32) correct 8% (00:53) wrong based on 287 sessions

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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

Originally posted by anilnandyala on 02 Nov 2010, 05:32.
Last edited by Bunuel on 19 Feb 2012, 22:25, edited 1 time in total.
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Re: the arthimetic and standard deviation  [#permalink]

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New post 02 Nov 2010, 05:49
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Re: the arthimetic and standard deviation  [#permalink]

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New post 02 Nov 2010, 14:32
Is this question really a 600-700 level?
What is the source?
Thanks
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Re: Arithmetic mean and standard deviation of a certain normal  [#permalink]

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New post 05 Oct 2019, 23:39
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Re: Arithmetic mean and standard deviation of a certain normal   [#permalink] 05 Oct 2019, 23:39
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