GMAT STATISTICS

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abhi75
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Topic: GMAT STATISTICS
PostFri May 02, 2008 2:09 pm
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This is a graph problem. Can someone please explain it. Thanks for your help.

Abhi
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Stuart Kovinsky
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PostFri May 02, 2008 6:27 pm
We're asked for the median # of hours. We know that there are 35 people total, so the median person is the 18th (from either direction).

Starting on the left, we have:

9 people at 1 hour
4 people (total 13) at 2 hours
1 person (total 14) at 3 hours
2 people (total 16)at 4 hours
1 person (total 17) at 5 hours

So, the next person is the 18th, which makes the median # of hours = 6.

We could have counted from the right as well:

10 people at 7 hours
8 people (total 18) at 6 hours.

We hit the 18th person in the 6 hours column, so the median is 6.
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abhi75
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PostSat May 03, 2008 7:18 am
Thanks Stuart for showing how to approach this kind of problems.

Thanks.
Abhi
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