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# The mean score of a set of students in a test is 80. If the test score

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Intern
Joined: 12 Sep 2016
Posts: 44
The mean score of a set of students in a test is 80. If the test score  [#permalink]

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27 May 2017, 08:26
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Difficulty:

75% (hard)

Question Stats:

22% (01:14) correct 78% (01:22) wrong based on 47 sessions

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The mean score of a set of students in a test is 80. If the test scores have a normal distribution and the standard deviation is given to be 7, approximately what percent of students has obtained score in the range between 66 and 94?
a)50%
b)68%
c)76%
d)82%
e)95%
Math Expert
Joined: 02 Sep 2009
Posts: 61283
Re: The mean score of a set of students in a test is 80. If the test score  [#permalink]

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27 May 2017, 08:29
2
Shaheensingh17 wrote:
The mean score of a set of students in a test is 80. If the test scores have a normal distribution and the standard deviation is given to be 7, approximately what percent of students has obtained score in the range between 66 and 94?
a)50%
b)68%
c)76%
d)82%
e)95%

Normal distribution and its 8.2-95.4-99.7 rule are NOT tested on the GMAT. You can ignore this question.
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Re: The mean score of a set of students in a test is 80. If the test score   [#permalink] 27 May 2017, 08:29
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# The mean score of a set of students in a test is 80. If the test score

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