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# The table below represents three sets of numbers with their

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Manager
Joined: 22 May 2007
Posts: 219
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The table below represents three sets of numbers with their [#permalink]  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
Manager
Joined: 20 Mar 2008
Posts: 160
Location: USA
Followers: 2

Kudos [?]: 29 [0], given: 0

Re: medians, means and standard deviation [#permalink]  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.

Re: medians, means and standard deviation   [#permalink] 03 Jun 2008, 07:41
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