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by parallel_chase » Tue Oct 14, 2008 4:24 am
amy's score = 90th percentile out of 80

amy' score = 90/100*80 = 72, this means there were 8 scores above her.

72/80

second class = 19 were higher than amy

100-19 = 81

81/100

combine scores

(72+81)/180 = 153/180 = 85%.

Another way of looking at this problem is.

Amy score between 90th and 81st percentile

there is only one option among the answer choices.

Hope this helps.
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by ket_gmat » Tue Oct 14, 2008 4:32 am
yup :)
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