Set T

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ritula: Senior | Next Rank: 100 Posts; Posts: 89; Joined: Sun Aug 10, 2008 8:35 pm

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.

Philosophers have interpreted world in various ways, the point is to change it!

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Source: Beat The GMAT — Data Sufficiency | Tue Sep 23, 2008 2:27 am

mals24: Legendary Member; Posts: 683; Joined: Tue Jul 22, 2008 1:58 pm; Location: Dubai; Thanked: 73 times; Followed by:2 members

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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Morgoth: Master | Next Rank: 500 Posts; Posts: 316; Joined: Mon Sep 22, 2008 12:04 am; Thanked: 36 times; Followed by:1 members

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?