It is currently 20 Sep 2017, 09:50

# Happening Now:

MBA Chat with Michelle Miller, MBA Admission Expert

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Percentage/ average

Author Message
Manager
Joined: 19 Aug 2009
Posts: 78

Kudos [?]: 270 [1], given: 46

### Show Tags

26 Aug 2009, 03:23
1
KUDOS
00:00

Difficulty:

(N/A)

Question Stats:

100% (03:09) correct 0% (00:00) wrong based on 2 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Q.
In a class 25% of the students were absent for an exam. 30% failed by 20 marks and 10% just passed because of grace marks of 5. Find the average score of the class if the remaining students scored an average of 60 marks and the pass marks are 33.

1. 37.266
2. 37.6
3. 37.8
4. 36.93
5. 37.5

Pretty easy question but answer given is 37.6 ( considering 75% students when calculating average...i understand 25% are absent...but when average of class is asked shouldnt 100% be included--- pls solve this confusion?)

Kudos [?]: 270 [1], given: 46

Senior Manager
Joined: 18 Aug 2009
Posts: 419

Kudos [?]: 140 [0], given: 16

Schools: UT at Austin, Indiana State University, UC at Berkeley
WE 1: 5.5
WE 2: 5.5
WE 3: 6.0

### Show Tags

26 Aug 2009, 03:56
Can not understand the wording of the problem. Pls help
_________________

Never give up,,,

Kudos [?]: 140 [0], given: 16

Senior Manager
Joined: 27 May 2009
Posts: 268

Kudos [?]: 513 [0], given: 18

### Show Tags

26 Aug 2009, 04:09
thr's somthing rong here?

Kudos [?]: 513 [0], given: 18

Director
Joined: 01 Apr 2008
Posts: 879

Kudos [?]: 814 [0], given: 18

Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014

### Show Tags

26 Aug 2009, 12:06
Ans should be 27.7 !! Anything missing?

Kudos [?]: 814 [0], given: 18

Manager
Joined: 25 Aug 2009
Posts: 174

Kudos [?]: 100 [0], given: 12

### Show Tags

26 Aug 2009, 13:44
Question seems to be incomplete. What is the source of this question?

Kudos [?]: 100 [0], given: 12

Manager
Joined: 28 Jul 2009
Posts: 123

Kudos [?]: 87 [0], given: 12

Location: India
Schools: NUS, NTU, SMU, AGSM, Melbourne School of Business

### Show Tags

27 Aug 2009, 05:01
Something is wrong here. What is the source?
_________________

GMAT offended me. Now, its my turn!
Will do anything for Kudos! Please feel free to give one.

Kudos [?]: 87 [0], given: 12

Manager
Joined: 13 Jan 2009
Posts: 170

Kudos [?]: 26 [0], given: 9

### Show Tags

27 Aug 2009, 05:37
Definitely something is wrong!

Kudos [?]: 26 [0], given: 9

Intern
Joined: 30 Jun 2009
Posts: 48

Kudos [?]: 11 [0], given: 2

### Show Tags

27 Aug 2009, 06:12
Economist wrote:
Ans should be 27.7 !! Anything missing?

Hi buddy,
asuming that question is ok, how did you get to your 27.7?
I have a totally different nbr

Assuming it is a class of 200 students.
50 were absent, and 150 were at the exam.
30% failed by 20 marks => means 45 students scored 13
10% just passed with a 5mark grant => means 15 students scored 28
the rest scored 60 => 90 students

avg = {(45x13)+(15x28)+(90x60)}/200 = 32.025

am I doing something wrong here?

Kudos [?]: 11 [0], given: 2

Director
Joined: 01 Apr 2008
Posts: 879

Kudos [?]: 814 [0], given: 18

Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014

### Show Tags

27 Aug 2009, 06:42
defoue wrote:
Economist wrote:
Ans should be 27.7 !! Anything missing?

Hi buddy,
asuming that question is ok, how did you get to your 27.7?
I have a totally different nbr

Assuming it is a class of 200 students.
50 were absent, and 150 were at the exam.
30% failed by 20 marks => means 45 students scored 13
10% just passed with a 5mark grant => means 15 students scored 28
the rest scored 60 => 90 students

avg = {(45x13)+(15x28)+(90x60)}/200 = 32.025

am I doing something wrong here?

Actually it is a poorly worded question. I took 30% of overall students, you have taken 30% of passed students and so on...that is why we are getting different answers. Logically yes, absent students are to be discounted but the question does not specify anything. It is also possible that 30% of overall failed

Kudos [?]: 814 [0], given: 18

Manager
Joined: 10 Jul 2009
Posts: 164

Kudos [?]: 114 [0], given: 8

### Show Tags

27 Aug 2009, 07:03
What is the source for this question?

Kudos [?]: 114 [0], given: 8

Senior Manager
Joined: 27 May 2009
Posts: 268

Kudos [?]: 513 [1], given: 18

### Show Tags

27 Aug 2009, 07:07
1
KUDOS
guess the ques is right ..IMO B

say 100 students are in class

75 appeared for test. 33 is passing mark

30 students got 13 marks each and failed by 20 marks - their total marks = 390

10 got 28 marks each and just passed by 5 grace - their total marks = 280 (excluding grace marks)

remaining 35 got 60 on average - their total marks = 2100

total marks secured by all 75 who appeared in test = 390+280+2100 = 2770

avg marks = 2770/75 = 36.93

-->note that if grace marks are included for 10 just passed students then

their total = 330

final total = 2820

avg marks = 2820/75 = 37.6

So it means grace marks have to be included

Kudos [?]: 513 [1], given: 18

Manager
Joined: 10 Aug 2009
Posts: 129

Kudos [?]: 74 [1], given: 10

### Show Tags

27 Aug 2009, 09:22
1
KUDOS
rohansherry wrote:
guess the ques is right ..IMO B

say 100 students are in class

75 appeared for test. 33 is passing mark

30 students got 13 marks each and failed by 20 marks - their total marks = 390

10 got 28 marks each and just passed by 5 grace - their total marks = 280 (excluding grace marks)

remaining 35 got 60 on average - their total marks = 2100

total marks secured by all 75 who appeared in test = 390+280+2100 = 2770

avg marks = 2770/75 = 36.93

-->note that if grace marks are included for 10 just passed students then

their total = 330

final total = 2820

avg marks = 2820/75 = 37.6

So it means grace marks have to be included

I comletely agree with this solution. No one says that absent students fail the course and should be given 0. But it is a tricky one. Kudo for you.
If you do not include 25% that were abscent you get the following:
40%X13+13.33%X28+46.66%X60=36.93

However, answer is D. They say "remaining"...so overlap is not possible

Kudos [?]: 74 [1], given: 10

Manager
Joined: 13 Jan 2009
Posts: 170

Kudos [?]: 26 [0], given: 9

### Show Tags

28 Aug 2009, 02:43
rohansherry wrote:
guess the ques is right ..IMO B

say 100 students are in class

75 appeared for test. 33 is passing mark

30 students got 13 marks each and failed by 20 marks - their total marks = 390

10 got 28 marks each and just passed by 5 grace - their total marks = 280 (excluding grace marks)

remaining 35 got 60 on average - their total marks = 2100

total marks secured by all 75 who appeared in test = 390+280+2100 = 2770

avg marks = 2770/75 = 36.93

-->note that if grace marks are included for 10 just passed students then

their total = 330

final total = 2820

avg marks = 2820/75 = 37.6

So it means grace marks have to be included

Why did you assume that all 10 students got 28? If the grace mark is 5, I understand that they could get min 28 marks. Is it possible the student got 30 marks and passed due to grace mark is 5? Correct me if i'm wrong

Kudos [?]: 26 [0], given: 9

Manager
Joined: 09 Aug 2009
Posts: 51

Kudos [?]: 8 [0], given: 1

### Show Tags

28 Aug 2009, 03:44
defoue wrote:
Economist wrote:
Ans should be 27.7 !! Anything missing?

Hi buddy,
asuming that question is ok, how did you get to your 27.7?
I have a totally different nbr

Assuming it is a class of 200 students.
50 were absent, and 150 were at the exam.
30% failed by 20 marks => means 45 students scored 13
10% just passed with a 5mark grant => means 15 students scored 28
the rest scored 60 => 90 students

avg = {(45x13)+(15x28)+(90x60)}/200 = 32.025

am I doing something wrong here?

I guess you need to include the grace marks also(anyway this marks also comes into the account).
Assuming total 200 students
30% = 45*13 = 585
10% = 15*33 = 495
60% = 90*60 = 5400
=32.2

/Prabu

Kudos [?]: 8 [0], given: 1

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 17575

Kudos [?]: 270 [0], given: 0

### Show Tags

17 Sep 2017, 22:20
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.
_________________

Kudos [?]: 270 [0], given: 0

Re: Percentage/ average   [#permalink] 17 Sep 2017, 22:20
Display posts from previous: Sort by