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

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Senior Manager
Joined: 21 Jun 2004
Posts: 336
The standard deviation of a certain set of data is 3. If 20 [#permalink]

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12 Nov 2004, 06:55
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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VP
Joined: 30 Sep 2004
Posts: 1480
Location: Germany

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12 Nov 2004, 07:02
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)
CIO
Joined: 09 Mar 2003
Posts: 463

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12 Nov 2004, 08:38
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
Senior Manager
Joined: 19 Oct 2004
Posts: 315
Location: Missouri, USA

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12 Nov 2004, 11:56
should be A...
20-3*2=14...
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Manager
Joined: 28 Aug 2004
Posts: 205

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15 Nov 2004, 23:56
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.
Manager
Joined: 28 Aug 2004
Posts: 205

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17 Nov 2004, 01:04
What's the OA for this one guys?
Senior Manager
Joined: 21 Jun 2004
Posts: 336

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17 Nov 2004, 06:43
Sorry for getting back so late.
OA is A.
This is a Deltacourse question.
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510 on my first GMAT. 610 on second GMAT.!
The struggle continues.

17 Nov 2004, 06:43
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