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Which set has the greatest standard deviation? I. 1, 3, 5,

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Joined: 11 May 2008
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Which set has the greatest standard deviation? I. 1, 3, 5, [#permalink]

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New post 09 Sep 2008, 18:12
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Which set has the greatest standard deviation?

I. 1, 3, 5, 7, 9

II. 2, 4, 6, 8, 10

III. 1, -1, -3, -5, -7


* I
* II
* III
* I and II
* none

since this requires application of the SD formula.. can it appear in the GAMT?

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Re: gretest SD [#permalink]

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New post 09 Sep 2008, 18:19
arjtryarjtry wrote:
Which set has the greatest standard deviation?

I. 1, 3, 5, 7, 9

II. 2, 4, 6, 8, 10

III. 1, -1, -3, -5, -7


* I
* II
* III
* I and II
* none

since this requires application of the SD formula.. can it appear in the GAMT?


I calculated this and got SD same for all the three options .
Hence E is the answer.
Yes such questions appear in GMAT
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cheers
Its Now Or Never

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Schools: Wharton
Re: gretest SD [#permalink]

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New post 09 Sep 2008, 18:48
arjtryarjtry wrote:
Which set has the greatest standard deviation?

I. 1, 3, 5, 7, 9

II. 2, 4, 6, 8, 10

III. 1, -1, -3, -5, -7


* I
* II
* III
* I and II
* none

since this requires application of the SD formula.. can it appear in the GAMT?


You don't need to apply the SD formula. The numbers in the sets are all in increments of 2. Therefore, SD is the same for all.

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Re: gretest SD   [#permalink] 09 Sep 2008, 18:48
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Which set has the greatest standard deviation? I. 1, 3, 5,

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