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saurabh_1922@yahoo.co.in
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 Posted: Tue Sep 04, 2007 8:27 pm Post subject: GMAT Prep - Standard deviation |
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The average of 100 numbers is 6, and the standard deviation is D, where D is positive. When added which of the following numbers, the new deviation will be less than D?
A. -6 and 0
B. 0 and 0
C. 0 and 6
D. 0 and 12
E. 6 and 6.
I face difficulty in solving Standard deviation problems.Does anyone have good material on this.
Please solve this question |
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hopefully
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| Posted: Wed Sep 05, 2007 3:42 am Post subject: |
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is is 6 and 6
thsi will not add to numerator of the SD formula but will add 2 to the denominator..
hence will decrease it... |
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