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# Q is a set of 10 numbers. What is the standard deviation of

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Manager
Joined: 19 Aug 2007
Posts: 206
Followers: 1

Kudos [?]: 32 [0], given: 0

Q is a set of 10 numbers. What is the standard deviation of [#permalink]  09 Jan 2008, 16:33
Q is a set of 10 numbers. What is the standard deviation of Q if the range of Q is zero?

0
1
5
10
insufficient information

I can think of two situations that meet the above criteria; but the one I chose was wrong...OA to follow, thanks.
Director
Joined: 08 Jun 2007
Posts: 584
Followers: 2

Kudos [?]: 79 [0], given: 0

Re: standard deviation and range [#permalink]  09 Jan 2008, 16:49
gmat blows wrote:
Q is a set of 10 numbers. What is the standard deviation of Q if the range of Q is zero?

0
1
5
10
insufficient information

I can think of two situations that meet the above criteria; but the one I chose was wrong...OA to follow, thanks.

range 0 means all numbers are same.
SD = 0
Manager
Joined: 19 Aug 2007
Posts: 206
Followers: 1

Kudos [?]: 32 [0], given: 0

Re: standard deviation and range [#permalink]  09 Jan 2008, 16:55
sometimes, I just want to throw my brain across the room...

I was thinking of situations, when the set contains -a and a; i.e {-3, x, x, x, 3}, but of course, range is 6, not zero/

thanks.
SVP
Joined: 28 Dec 2005
Posts: 1583
Followers: 2

Kudos [?]: 88 [0], given: 2

Re: standard deviation and range [#permalink]  09 Jan 2008, 17:25
ashkrs wrote:
gmat blows wrote:
Q is a set of 10 numbers. What is the standard deviation of Q if the range of Q is zero?

0
1
5
10
insufficient information

I can think of two situations that meet the above criteria; but the one I chose was wrong...OA to follow, thanks.

range 0 means all numbers are same.
SD = 0

Re: standard deviation and range   [#permalink] 09 Jan 2008, 17:25
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