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Gmatclub test M08 Q10

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Gmatclub test M08 Q10 [#permalink] New post 10 Aug 2011, 10:36
Hi,

Can anyone please explain me this questions from one of the gmat club test - M08 Q9

If set T consists of odd integers divisible by 5, is the standard deviation of T positive?

1. All members of T are positive
2. T consists of only one member

Statement (1) by itself is insufficient. S1 doesn't help answer the question.

I don't understand the above explanation for statement 1.

Under what circumstances can the standard deviation be negative? none right?

Please explain.

Thanks!
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Re: Gmatclub test M08 Q10 [#permalink] New post 10 Aug 2011, 11:08
teal wrote:
Hi,

Can anyone please explain me this questions from one of the gmat club test - M08 Q9

If set T consists of odd integers divisible by 5, is the standard deviation of T positive?

1. All members of T are positive
2. T consists of only one member

Statement (1) by itself is insufficient. S1 doesn't help answer the question.

I don't understand the above explanation for statement 1.

Under what circumstances can the standard deviation be negative? none right?

Please explain.

Thanks!


Std dev can't be -ve, but can be 0. 0 is neither +ve nor -ve.
_________________

~fluke

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Concentration: Finance, Real Estate
GMAT Date: 12-27-2011
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Re: Gmatclub test M08 Q10 [#permalink] New post 16 Aug 2011, 09:59
[quote="teal"]Hi,

Can anyone please explain me this questions from one of the gmat club test - M08 Q9

If set T consists of odd integers divisible by 5, is the standard deviation of T positive?

1. All members of T are positive
2. T consists of only one member

Statement (1) by itself is insufficient. S1 doesn't help answer the question.

I don't understand the above explanation for statement 1.

well i have my struggle with SD, but if i get it right then:


S1- SD can be positive if the set is 5 15 20 i.e but can be 0 if the set is 5 5 5 5 so not suf.
S2- only one number in a set wll allways have SD 0 so the answer is definately NO. suff.
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Re: Gmatclub test M08 Q10 [#permalink] New post 16 Aug 2011, 10:55
Thanks to both fluke and dimiri! Thanks guys for helping me out.
Re: Gmatclub test M08 Q10   [#permalink] 16 Aug 2011, 10:55
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