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Set S

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Set S

by crackgmat007 » Sat Oct 03, 2009 5:11 pm
If the mean of set S is 20, what is the median of set S ?

1. In set S there are as many numbers larger than 20 as there are numbers smaller than 20.
2. All numbers in set S are even integers.

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Source: — Data Sufficiency |
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by Dobrov » Wed Oct 14, 2009 12:22 pm
Very tough...

(1) As many numbers larger as smaller than 20.

could be either (18, 20, 22) or (18,18,21,23) with both diff. median insuff.

(2) All numbers are even integers

could either be (18, 20, 22) or (14, 22, 24)

insuff.

(1&2) could either be (18,18,22,22) or (14,18,24,24).
insuff.
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