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Std Dev

by karthikpandian19 » Wed Jan 04, 2012 9:45 pm
Set S consists of N elements. If N>2, what is the standard deviation of S?
(1) The mean and median of the set are equal
(2) The difference between any two elements of the set is equal
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Source: — Data Sufficiency |
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by sam2304 » Thu Jan 05, 2012 12:15 am
With 1
The set can be [2 4 6] or [4 4 4] both have same mean and median but SD is different so insuff.

With 2

All elements are same. SD is about how much the values are spread out from mean. So its 0.

IMO B.
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by karthikpandian19 » Thu Jan 05, 2012 8:48 pm
OA is B
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