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

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Joined: 11 May 2008
Posts: 551
Which set has the greatest standard deviation? I. 1, 3, 5, [#permalink]

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New post 09 Sep 2008, 18:12
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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VP
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Joined: 17 Jun 2008
Posts: 1290
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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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.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
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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