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# The average (arithmetic mean) of a normal distribution

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Intern
Joined: 06 Jun 2012
Posts: 31
Followers: 1

Kudos [?]: 11 [0], given: 62

The average (arithmetic mean) of a normal distribution [#permalink]

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15 Jul 2012, 16:36
00:00

Difficulty:

75% (hard)

Question Stats:

37% (01:40) correct 63% (00:42) wrong based on 41 sessions

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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
Math Expert
Joined: 02 Sep 2009
Posts: 32657
Followers: 5656

Kudos [?]: 68734 [0], given: 9818

Re: The average (arithmetic mean) of a normal distribution [#permalink]

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15 Jul 2012, 16:39
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
_________________
Re: The average (arithmetic mean) of a normal distribution   [#permalink] 15 Jul 2012, 16:39
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