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The average (arithmetic mean) of a normal distribution

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The average (arithmetic mean) of a normal distribution [#permalink] New post 15 Jul 2012, 15:36
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36% (01:46) correct 64% (00:45) wrong based on 36 sessions
The average (arithmetic mean) of a normal distribution of a school's test scores is 65, and standard deviation of the distribution is 6.5. A student scoring a 78 on the exam is in what percentile of the school?

A) 63rd percentile
B) 68th percentile
C) 84th percentile
D) 96th percentile
E) 98th percentile
[Reveal] Spoiler: OA
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Re: The average (arithmetic mean) of a normal distribution [#permalink] New post 15 Jul 2012, 15:39
Expert's post
Alterego wrote:
The average (arithmetic mean) of a normal distribution of a school's test scores is 65, and standard deviation of the distribution is 6.5. A student scoring a 78 on the exam is in what percentile of the school?

A) 63rd percentile
B) 68th percentile
C) 84th percentile
D) 96th percentile
E) 98th percentile



Check this topic: the-average-arithmetic-mean-of-a-normal-distribution-of-a-99222.html
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Re: The average (arithmetic mean) of a normal distribution   [#permalink] 15 Jul 2012, 15:39
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