GRE Prep 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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
Amy's grade was 90th percentile of the 80 grades for her class. Of the
[#permalink]
24 Sep 2022, 06:54
24 Sep 2022, 06:54
Expert Reply
1
Bookmarks
00:00
A
B
C
D
E
Question Stats:
100% (01:05) correct
0% (00:00) wrong based on 1 sessions
Show timer Statistics
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 of two classes combined?
A. 72nd
B. 80th
C. 81st
D. 85th
E. 92nd
A. 72nd
B. 80th
C. 81st
D. 85th
E. 92nd
Re: Amy's grade was 90th percentile of the 80 grades for her class. Of the
[#permalink]
28 Sep 2022, 09:29
28 Sep 2022, 09:29
Expert Reply
If someone's grade is in xth percentile of the n grades, this means that x of people out of n has the grades less than this person.
Being in 90th percentile out of 80 grades means Amy outscored 80∗0.9=72 classmates.
In another class she would outscored 100−19=81 students (note: Amy herself is not in this class).
So, in combined classes she outscored 72+81=153. As there are total of 80+100=180 students, so Amy is in 153180=0.85=85, or in 85th percentile.
Answer: D.
Being in 90th percentile out of 80 grades means Amy outscored 80∗0.9=72 classmates.
In another class she would outscored 100−19=81 students (note: Amy herself is not in this class).
So, in combined classes she outscored 72+81=153. As there are total of 80+100=180 students, so Amy is in 153180=0.85=85, or in 85th percentile.
Answer: D.
gmatclubot
Re: Amy's grade was 90th percentile of the 80 grades for her class. Of the [#permalink]
28 Sep 2022, 09:29
Moderators:
