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Set T

by ritula » Tue Sep 23, 2008 2:27 am
Set T consists of odd integers divisible by 5. Is standard deviation of T positive?

(1)All members of T are positive
(2) T consists of only one member
Last edited by ritula on Tue Sep 23, 2008 7:14 am, edited 1 time in total.
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Source: — Data Sufficiency |
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by mals24 » Tue Sep 23, 2008 3:20 am
Hey have you posted the question properly because " Is standard deviation of positive?" doesn't make sense?
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Re: Set T

by Morgoth » Tue Sep 23, 2008 5:56 am
ritula wrote:Set T consists of odd integers divisible by 5. Is standard deviation of positive?

(1)All members of T are positive
(2) T consists of only one member
I think the question is asking whether the SD is 0 or positive.

Statement I

all integers are positive

T = [15,15,15]
SD = 0

T = [5,15,25]
SD = positive

Insufficient.

Statement II
T = [5]
SD = 0
T =[25]
SD = 0

Sufficient.

Hence B

OA?
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by ritula » Tue Sep 23, 2008 7:15 am
Thanks for pointing d mistake. I have edited the statement.
mals24 wrote:Hey have you posted the question properly because " Is standard deviation of positive?" doesn't make sense?
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OA

by ritula » Tue Sep 23, 2008 7:20 am
OA is B
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