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

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Manager
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Q is a set of 10 numbers. What is the standard deviation of [#permalink] New post 09 Jan 2008, 17:33
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.
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Re: standard deviation and range [#permalink] New post 09 Jan 2008, 17:49
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
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Re: standard deviation and range [#permalink] New post 09 Jan 2008, 17:55
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.
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Re: standard deviation and range [#permalink] New post 09 Jan 2008, 18:25
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, 18:25
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