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There is the Q-set consisting of 10 integers. Are they

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There is the Q-set consisting of 10 integers. Are they [#permalink] New post 20 May 2003, 00:00
There is the Q-set consisting of 10 integers. Are they equal?

(1) The range of Q is 0.
(2) The standard deviation of Q is 0.
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 [#permalink] New post 20 May 2003, 05:13
from either set we know that all numbers are equal.

(1) Range is a difference between the largest and the smallest. If it a zero, they are equal, as are all the rest.

(2) SD is a measure of 'scattering' from the ariphmetic average. If it is a zero, there is no scattering--all numbers are equal to their average. So they are all equal again.
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 [#permalink] New post 18 Mar 2006, 22:02
ah...forgot all about the SD funda...
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 [#permalink] New post 19 Mar 2006, 09:51
Good question. Had forgotten what range was :oops:
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  [#permalink] 19 Mar 2006, 09:51
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