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# SD-MEAN

Author Message
Manager
Joined: 09 Oct 2008
Posts: 93

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14 Oct 2008, 20:51
Hi Friends
PFA
Thanks

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Intern
Joined: 23 Sep 2008
Posts: 15

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14 Oct 2008, 21:27
The average is 100. 1 SD below the mean is 100-22.4 = 77.6. Hence ths answer should be 8, as 8 of the timings are above this time. Some how I think the question should have been the number of timings below 1sd below the mean. then the answer is right ie; 2.

But I mioght be wrong.
VP
Joined: 17 Jun 2008
Posts: 1484

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15 Oct 2008, 00:33
anuprajan5 wrote:
The average is 100. 1 SD below the mean is 100-22.4 = 77.6. Hence ths answer should be 8, as 8 of the timings are above this time. Some how I think the question should have been the number of timings below 1sd below the mean. then the answer is right ie; 2.

But I mioght be wrong.

Question does ask for number of timings below 1sd of mean and hence 2 is the right answer.

--== 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: SD-MEAN   [#permalink] 15 Oct 2008, 00:33
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# SD-MEAN

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