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A researcher computed the mean, the median, and the standard

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A researcher computed the mean, the median, and the standard [#permalink] New post 17 Mar 2007, 11:51
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69% (01:21) correct 31% (00:33) wrong based on 98 sessions
A researcher computed the mean, the median, and the standard deviation for a set of performance scores. If 5 were to be added to each score, which of these three statistics would change?

A) The mean only
B) The median only
C) The standard deviation only
D) The mean and the median
E) The mean and the standard deviation

Official Guide 12 Question

GMAT Official Guide 12

Question: 9
Page: 21
Difficulty: 600

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Video Explanations:
[Reveal] Spoiler: OA
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 [#permalink] New post 17 Mar 2007, 12:03
D it is yes :)

A standart deviation never changes when a constant is added to all elements of a same set :)

The construction of the standart deviation is made on the idea that we observe how far the data are from the average. Thus, the distance will always remain the same if we add a constant to every data present in the set.

To make an analogy, we can imagine an spacecraft. All dimensions of it remain the same no matter where we are. The height and the width will be exactly the same if we are at 100 km from the surface of the earth or at 2 000 km from it. The position of its center of gravity will change compared between the 2 distance (it's the average) but all parts of it will keep the same distance to its center of gravity (similarly to the standart deviation).

:)
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 [#permalink] New post 17 Mar 2007, 16:37
A researcher computed the mean, the median, and the standard deviation for a set of performance scores. If 5 were to be added to each score, which of these three statistics would change?

A) The mean only
B) The median only
C) The standard deviation only
D) The mean and the median
E) The mean and the standard deviation

Official Guide 12 Question

GMAT Official Guide 12

Question: 12
Page: 145
Difficulty: 700

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Video Explanations:
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  [#permalink] 17 Mar 2007, 16:37
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A researcher computed the mean, the median, and the standard

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