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Both a set S and a set P have the same number of elements. I

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by Max@Math Revolution » Sat Sep 10, 2016 8:42 pm
Both a set S and a set P have the same number of elements. Is a standard deviation of the set P smaller than the standard deviation of the set S?
1) All elements of the set P is multiples of 3.
2) All elements of the set S is multiples of 9.

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Source: — Data Sufficiency |
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by Max@Math Revolution » Mon Sep 12, 2016 7:58 am
From the original condition, we have to know all elements of the set S. Hence, there is a high chance that E is the correct answer. Using 1) & 2), P={3,6,9}, S={9,18,27} yes, P={3, 30,300}, S={9,18,27} no. Hence, the conditions are not sufficient, and the correct answer is E.
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