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# 1st q in a gmatprep test

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01 Apr 2007, 08:57
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1st q in a gmatprep test
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Director
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01 Apr 2007, 11:50
Answer is D i.e. 85th percentile

explanation:

90th percentile of 80 grades means 8 students are above amy, while in another class 19 students are above amy out of 100 students.

combining both, there are 27 students above amy, which means her position is 153 in the class of 180 students. hence answer is 85th percentile.

regards,

Amardeep
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01 Apr 2007, 12:22
D, Agree

My way: Total students: 80+100 = 180
Students abbove her: 8 + 19 = 27

27/180 ... divide both by 9 = 3/20 divide both by 2....1.5/10
times both by 10 and you have 15/100
she is therefore in the top 15% = 85th percentile
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01 Apr 2007, 19:07
D is correct

thanks Amardeep and fmeinsen for your explanation
01 Apr 2007, 19:07
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