Find all School-related info fast with the new School-Specific MBA Forum

It is currently 20 Oct 2014, 16:42

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Amys grade was the 90 percentile of the 80 grades for her

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
1 KUDOS received
Senior Manager
Senior Manager
avatar
Joined: 22 Sep 2005
Posts: 280
Followers: 1

Kudos [?]: 56 [1] , given: 1

Amys grade was the 90 percentile of the 80 grades for her [#permalink] New post 30 Jan 2008, 11:23
1
This post received
KUDOS
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Amy´s grade was the 90 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) 72
B) 80
C) 81
D) 85
E) 92
Senior Manager
Senior Manager
User avatar
Joined: 29 Nov 2006
Posts: 321
Location: Orange County, CA
Followers: 1

Kudos [?]: 22 [0], given: 0

Re: PS: Percentile [#permalink] New post 30 Jan 2008, 11:29
Quote:
Amy´s grade was the 90 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) 72
B) 80
C) 81
D) 85
E) 92


D

If Amy was 90th percentile out of 80, there were 72 scores below hers.
If Amy had 19 scores above hers in another class, 81 were below hers.

Total population: 180
Scores below Amy's: 72 + 81 = 153

153/180 = 85%
Director
Director
avatar
Joined: 01 Jan 2008
Posts: 629
Followers: 3

Kudos [?]: 131 [0], given: 1

Re: PS: Percentile [#permalink] New post 30 Jan 2008, 11:33
netcaesar wrote:
Amy´s grade was the 90 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) 72
B) 80
C) 81
D) 85
E) 92


D - 85%.

number of grades not exceeding Amy's (72+(100-19))
total number of students 80+100
percentile: (72+81)/180=153/180 = 85%
CEO
CEO
User avatar
Joined: 29 Mar 2007
Posts: 2593
Followers: 16

Kudos [?]: 197 [0], given: 0

Re: PS: Percentile [#permalink] New post 30 Jan 2008, 13:55
netcaesar wrote:
Amy´s grade was the 90 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) 72
B) 80
C) 81
D) 85
E) 92


She is 72/80 in the first and 80/100 in the second.

Thus there are 27 people ahead of Amy. 180-27=153 ---> 153/180~85%
SVP
SVP
avatar
Joined: 28 Dec 2005
Posts: 1593
Followers: 2

Kudos [?]: 75 [0], given: 2

Re: PS: Percentile [#permalink] New post 30 Jan 2008, 18:59
in her class, she is in the top 8, i.e. 72 people scored lower than her

in the second class, she is in the top 19, i.e. 81 people scored lower than her

overall, she is 153/180 (you get 153 because shes scored higher than a total of 72+81=153 ppl)
SVP
SVP
avatar
Joined: 04 May 2006
Posts: 1941
Schools: CBS, Kellogg
Followers: 18

Kudos [?]: 320 [0], given: 1

Premium Member
Re: PS: Percentile [#permalink] New post 30 Jan 2008, 19:14
maratikus wrote:
netcaesar wrote:
Amy´s grade was the 90 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) 72
B) 80
C) 81
D) 85
E) 92


D - 85%.

number of grades not exceeding Amy's (72+(100-19))
total number of students 80+100
percentile: (72+81)/180=153/180 = 85%


Hi everybody,

I am very confused with this problem. The question is about "Amy's grade was what percentile of the grades of the two classes combined?", but guys all of you go to find the grades of not exceeding Amy's, and then credit it with what question asked. I this is my weakness. Can anybody help me to make clear it? Thank you!
_________________

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Senior Manager
Senior Manager
User avatar
Joined: 29 Nov 2006
Posts: 321
Location: Orange County, CA
Followers: 1

Kudos [?]: 22 [0], given: 0

Re: PS: Percentile [#permalink] New post 31 Jan 2008, 10:06
Quote:
Hi everybody,

I am very confused with this problem. The question is about "Amy's grade was what percentile of the grades of the two classes combined?", but guys all of you go to find the grades of not exceeding Amy's, and then credit it with what question asked. I this is my weakness. Can anybody help me to make clear it? Thank you!


The key to this question is to understand what is being asked. The question is asking where Amy's grade ranks in comparison to the two classes combined (class A: 80 kids, and class B: 100 kids). The stem gives you her ranking individually but you need to calculate her ranking overall. It's similar to a weighted average question.

Does that help?
Re: PS: Percentile   [#permalink] 31 Jan 2008, 10:06
    Similar topics Author Replies Last post
Similar
Topics:
1 Amy's grade was the 90th percentile of the 80 grades for her harshavmrg 3 26 Jun 2011, 02:00
Amys grade was the 90th Percentile of the 80 grades in her tlntd42 1 26 Sep 2007, 21:46
Amy's grade was the 90th percentile of the 80 grades for her johnycute 3 26 Jul 2007, 01:54
Amy's grade was 90th percentile of the 80 grades for her X & Y 1 10 Jun 2006, 11:59
Amy's grade was the 90th percentile of the 80 grades for her coffeeloverfreak 2 22 Sep 2005, 20:53
Display posts from previous: Sort by

Amys grade was the 90 percentile of the 80 grades for her

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.