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What is the mean of the exams taken by a group of students?

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Source: — Data Sufficiency |

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by Jay@ManhattanReview » Thu Sep 05, 2019 11:45 pm

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BTGmoderatorDC wrote:What is the mean of the exams taken by a group of students?

(1) The score 3 standard deviations above the mean is 95
(2) The score 2 standard deviations below the mean is 64

OA C

Source: Veritas Prep
Say mean is X and the standard deviation is D; thus, from Statement 1, we have X + 3D = 95 and from Statement 2, we have X - 2D = 64. From both the equations, we can get the unique value of X. Sufficient.

The correct answer: C

Hope this helps!

-Jay
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