GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 20 Jun 2018, 15:59

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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

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

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Status: I will not stop until i realise my goal which is my dream too
Joined: 25 Feb 2010
Posts: 208
Schools: Johnson '15
Amy's grade was the 90th percentile of the 80 grades for her [#permalink]

Show Tags

New post 26 Jun 2011, 03:00
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

57% (01:38) correct 43% (01:12) wrong based on 21 sessions

HideShow timer Statistics

Amy's grade was the 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?

1. 72nd
2. 80th
3. 81st
4. 85th
5. 92nd

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

Regards,
Harsha

Note: Give me kudos if my approach is right , else help me understand where i am missing.. I want to bell the GMAT Cat ;)

Satyameva Jayate - Truth alone triumphs

1 KUDOS received
Math Forum Moderator
avatar
Joined: 20 Dec 2010
Posts: 1900
Re: GMAT PREP TEST 2 - Q1 [#permalink]

Show Tags

New post 26 Jun 2011, 03:23
1
harshavmrg wrote:
Amy's grade was the 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?

1. 72nd
2. 80th
3. 81st
4. 85th
5. 92nd


90th percentile of 80 means 10% scored higher than Amy.
Thus, Amy's rank=80*0.9=72

Another class; 100 grades
19 of them were higher; i.e. Amy's rank=81

Total grades=100+80=180
Amy's grade overall=72+81=153

153 is what percent of 180; 153/180=51/60=17/20=85/100

85th percentile.

Ans: "D"
_________________

~fluke

GMAT Club Premium Membership - big benefits and savings

1 KUDOS received
Manager
Manager
avatar
Status: I will not stop until i realise my goal which is my dream too
Joined: 25 Feb 2010
Posts: 208
Schools: Johnson '15
Re: GMAT PREP TEST 2 - Q1 [#permalink]

Show Tags

New post 26 Jun 2011, 05:20
1
i think they had discussed the same problem here too...

http://www.beatthegmat.com/percentile-p ... 46485.html

I think, based on the link above, the solution is best explained as
in Amy's class 9 were above her and in the other class there were 19 above her...so in the combined class 9+19= 28

the combined class strength is 100+80 = 180

so now 180-28= 152

so

152/180 = x/100

x= 84.44 percentile

hence rounding it off, it is 85th percentile...

i hope this answers..but i am still not convinced though....
_________________

Regards,
Harsha

Note: Give me kudos if my approach is right , else help me understand where i am missing.. I want to bell the GMAT Cat ;)

Satyameva Jayate - Truth alone triumphs

Manager
Manager
avatar
Status: I will not stop until i realise my goal which is my dream too
Joined: 25 Feb 2010
Posts: 208
Schools: Johnson '15
Re: GMAT PREP TEST 2 - Q1 [#permalink]

Show Tags

New post 26 Jun 2011, 05:21
@Fluke...thanks for the answer...
_________________

Regards,
Harsha

Note: Give me kudos if my approach is right , else help me understand where i am missing.. I want to bell the GMAT Cat ;)

Satyameva Jayate - Truth alone triumphs

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 7009
Premium Member
Re: Amy's grade was the 90th percentile of the 80 grades for her [#permalink]

Show Tags

New post 13 Sep 2017, 10:30
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: Amy's grade was the 90th percentile of the 80 grades for her   [#permalink] 13 Sep 2017, 10:30
Display posts from previous: Sort by

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

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.