MathRevolution wrote:

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.

*An answer will be posted in 2 days.

Answer E.

Statement 1 : No information about Set S. - Insufficient

Statement 2 : No information about Set P. - Insufficient

Combining, It could happen that all the elements of Set P are also multiple of 9. Hence, in that case there would be Zero SD and if not, then there would be some SD. Hence, insufficient.

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