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Gmat prep percentile

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by VP_Jim » Tue Jun 03, 2008 11:27 am
This is a good one, thanks for posting.

If Amy is the 90th percentile in a class of 80 students, that means that she was number 72 out of 80 (calculation: .9 * 80). So, there were 8 scores above her.

Now combined, there are 180 students (80 + 100). Of those, 27 scored higher than Amy (the 8 we already calculated plus the 19 in the other class).

Thus, Amy was score number 153 out of 180, which is the 85% percentile (calculation: 153/180).

Hope this helps!
Jim S. | GMAT Instructor | Veritas Prep
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by vinviper1 » Fri Jun 06, 2008 8:39 am
Very welcome!

And thank you! A bit tricky..especially for Q1. Thanks.
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by Stuart@KaplanGMAT » Fri Jun 06, 2008 5:26 pm
There's a MUCH quicker way to find the answer to this question.

Amy was 81st %ile in one class and 90th %ile in the other class. Therefore, her OVERALL %ile must be between 81st and 90th.

Only one answer fits within that range: choose 85th.
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by erjamit » Sun Aug 03, 2008 4:28 am
I too got this question as my first question and was stumped :(.. I guessed it and unfortunately it was wrong :(
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