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The table below represents three sets of numbers with their

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The table below represents three sets of numbers with their [#permalink] New post 03 Jun 2008, 03:57
The table below represents three sets of numbers with their respective medians, means and standard deviations. The third set, Set [A+B], denotes the set that is formed by combining Set A and Set B.

Median Mean Standard Deviation
Set A X Y Z
Set B L M N
Set [A + B] Q R S


If X – Y > 0 and L – M = 0, then which of the following must be true?

I. Z > N
II. R > M
III. Q > R


I only
II only
III only
I and II only
none
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Re: medians, means and standard deviation [#permalink] New post 03 Jun 2008, 07:41
I. Z > N

We can not say this as we do not know the SD of either of these sets.


II. R > M

From the given info we can not determine this. We do not know if Y is greater than M or less than M.

III. Q > R

No info.


none should be the answer
Re: medians, means and standard deviation   [#permalink] 03 Jun 2008, 07:41
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The table below represents three sets of numbers with their

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