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Director
Status: Finally Done. Admitted in Kellogg for 2015 intake
Joined: 25 Jun 2011
Posts: 538
Location: United Kingdom
GMAT 1: 730 Q49 V45
GPA: 2.9
WE: Information Technology (Consulting)
Followers: 63

Kudos [?]: 2262 [0], given: 217

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20 Nov 2011, 05:50
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Difficulty:

(N/A)

Question Stats:

60% (01:01) correct 40% (00:28) wrong based on 4 sessions

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Amy's grade was the 90th percentile of the 80 grades for her class. Of the 100 grades from another class, 19 was higher than Amy's and the rest was lower. If no other grade is the same as Amy' grade, then Army's grade was what percentile of grades of two class combined.

72nd
80th
81st
85th
92nd

Any idea folks what could be the answer please and how to solve?
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Best Regards,
E.

MGMAT 1 --> 530
MGMAT 2--> 640
MGMAT 3 ---> 610
GMAT ==> 730

Manager
Joined: 20 Aug 2011
Posts: 146
Followers: 3

Kudos [?]: 84 [0], given: 0

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20 Nov 2011, 07:13
People above Amy in her class =10/100*80=8
People above Amy in other class=19
Total people =27
Percentile above=27/180*100=3/20*100=15

Hence 85

If you're into weighted average & stuff-

Her grade falls in the 81st percentile in the other class as in that class of 100 19 had higher grades than Amy's.

90 (80/180) + 81 (100/180) =85
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You may send me a PM if you have any doubts about my solution or GMAT problems in general.

Senior Manager
Status: D-Day is on February 10th. and I am not stressed
Affiliations: American Management association, American Association of financial accountants
Joined: 12 Apr 2011
Posts: 269
Location: Kuwait
Schools: Columbia university
Followers: 4

Kudos [?]: 203 [0], given: 52

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20 Nov 2011, 15:36
85 percintile, not sure though, i used POE
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