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The standard deviation of a certain set of data is 3. If 20

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Senior Manager
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The standard deviation of a certain set of data is 3. If 20 [#permalink] New post 12 Nov 2004, 05:55
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The standard deviation of a certain set of data is 3. If 20 is 2 standard deviations away from the mean, which of the following values could be the mean of the set of data?

A. 14
B. 20
C. 24
D. 18
E. 25
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 [#permalink] New post 12 Nov 2004, 06:02
is it a) ?

2 SD away from the mean means 2 * 3 = 6 means 20 + 6 = 26 or 20 - 6 = 14; so it is a)
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 [#permalink] New post 12 Nov 2004, 07:38
christoph wrote:
is it a) ?

2 SD away from the mean means 2 * 3 = 6 means 20 + 6 = 26 or 20 - 6 = 14; so it is a)


definately. it's a
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 [#permalink] New post 12 Nov 2004, 10:56
should be A...
20-3*2=14...
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 [#permalink] New post 15 Nov 2004, 22:56
The way I see it is that number 20 has a lower standard deviation than that of the whole set of data . So it has to be closer to the mean. Among the choices, the closest would a mean of 18.
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 [#permalink] New post 17 Nov 2004, 00:04
What's the OA for this one guys?
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 [#permalink] New post 17 Nov 2004, 05:43
Sorry for getting back so late.
OA is A.
This is a Deltacourse question.
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  [#permalink] 17 Nov 2004, 05:43
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The standard deviation of a certain set of data is 3. If 20

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