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# SD-MEAN

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Manager
Joined: 09 Oct 2008
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SD-MEAN [#permalink]  14 Oct 2008, 19:51
Hi Friends
PFA
Thanks
Attachments

SD-Mean.JPG [ 29.23 KiB | Viewed 785 times ]

Intern
Joined: 23 Sep 2008
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Re: SD-MEAN [#permalink]  14 Oct 2008, 20:27
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.
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Joined: 17 Jun 2008
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Re: SD-MEAN [#permalink]  14 Oct 2008, 23:33
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.
Re: SD-MEAN   [#permalink] 14 Oct 2008, 23:33
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