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# Amy's grade was 90th percentile of the 80 grades for her

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Manager
Joined: 25 May 2006
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Amy's grade was 90th percentile of the 80 grades for her [#permalink]  10 Jun 2006, 11:59
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Amy's grade was 90th percentile of the 80 grades for her class. Of the 100 grades from another class, 19 were higher than Amy's, and the rest were lower. If no other grade was the same as Amy's grade, then Amy's grade was what percentile of the grades of the two classes combined?

A. 72nd
B. 80th
C. 81st
D. 85th
E. 92nd

Manager
Joined: 19 Apr 2006
Posts: 231
Followers: 1

Kudos [?]: 1 [0], given: 0

[#permalink]  10 Jun 2006, 15:59
D =85

total amount of grades 180
Amy at 90th = 72
19 higher than Amy = 81
therefore, (72+81)/180 = 85%
[#permalink] 10 Jun 2006, 15:59
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# Amy's grade was 90th percentile of the 80 grades for her

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