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# Arithmetic mean and standard deviation of a certain normal

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Manager
Joined: 07 Feb 2010
Posts: 155

Kudos [?]: 741 [0], given: 101

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

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02 Nov 2010, 05:32
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Difficulty:

5% (low)

Question Stats:

89% (00:21) correct 11% (00:39) wrong based on 285 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
[Reveal] Spoiler: OA

Last edited by Bunuel on 19 Feb 2012, 22:25, edited 1 time in total.
Edited the question

Kudos [?]: 741 [0], given: 101

Math Expert
Joined: 02 Sep 2009
Posts: 41886

Kudos [?]: 128668 [0], given: 12181

Re: the arthimetic and standard deviation [#permalink]

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02 Nov 2010, 05:49
Expert's post
1
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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.

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Kudos [?]: 128668 [0], given: 12181

Manager
Joined: 10 Sep 2010
Posts: 127

Kudos [?]: 37 [0], given: 7

Re: the arthimetic and standard deviation [#permalink]

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02 Nov 2010, 14:32
Is this question really a 600-700 level?
What is the source?
Thanks

Kudos [?]: 37 [0], given: 7

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 16724

Kudos [?]: 273 [0], given: 0

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

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19 Jun 2014, 04:48
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Kudos [?]: 273 [0], given: 0

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 16724

Kudos [?]: 273 [0], given: 0

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

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14 Dec 2015, 07:27
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Kudos [?]: 273 [0], given: 0

Re: Arithmetic mean and standard deviation of a certain normal   [#permalink] 14 Dec 2015, 07:27
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