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# The distribution of scores on a math test had a mean of 82 percent wit

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Math Expert
Joined: 02 Sep 2009
Posts: 50001
The distribution of scores on a math test had a mean of 82 percent wit  [#permalink]

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05 Nov 2017, 01:52
00:00

Difficulty:

15% (low)

Question Stats:

87% (00:48) correct 13% (01:00) wrong based on 48 sessions

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The distribution of scores on a math test had a mean of 82 percent with a standard deviation of 5 percent. The score that is exactly 2 standard deviations above the mean is

(A) 72%
(B) 82%
(C) 92%
(D) 95%
(E) cannot be determined

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Re: The distribution of scores on a math test had a mean of 82 percent wit  [#permalink]

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05 Nov 2017, 02:51
Bunuel wrote:
The distribution of scores on a math test had a mean of 82 percent with a standard deviation of 5 percent. The score that is exactly 2 standard deviations above the mean is

(A) 72%
(B) 82%
(C) 92%
(D) 95%
(E) cannot be determined

Since the mean of the scores in the math test are 82% and the standard deviation is 5%,
a score that is exactly 2 standard deviations above the means is 82 + 2(5) = 92%(Option C)
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Re: The distribution of scores on a math test had a mean of 82 percent wit &nbs [#permalink] 05 Nov 2017, 02:51
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