For a certain exam,a score of 58 was 2 standard deviations b

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For a certain exam,a score of 58 was 2 standard deviations b [#permalink]

06 Mar 2012, 04:06

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For a certain exam,a score of 58 was 2 standard deviations below mean and a score of 98 was 3 standard deviations above mean.What was the mean score for the exam?

A. 74
B. 76
C. 78
D. 80
E. 82

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Re: For a certain exam,a score of 58 was 2 standard deviations b [#permalink]

06 Mar 2012, 04:11

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MaithiliGokarn wrote:

For a certain exam,a score of 58 was 2 standard deviations below mean and a score of 98 was 3 standard deviations above mean.What was the mean score for the exam?

A. 74
B. 76
C. 78
D. 80
E. 82

Welcome to GMAT Club. Below is a solution to your question.

A score of 58 was 2 standard deviations below the mean --> 58 = Mean - 2d
A score of 98 was 3 standard deviations above the mean --> 98 = Mean + 3d

Solving above for Mean = 74.

Answer: A.

For more about the Standard Deviation please check: Standard Deviation.

Hope it helps.
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Re: For a certain exam,a score of 58 was 2 standard deviations b [#permalink] 06 Mar 2012, 04:11

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For a certain exam,a score of 58 was 2 standard deviations b

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For a certain exam,a score of 58 was 2 standard deviations b

For a certain exam,a score of 58 was 2 standard deviations b

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