Summer is Coming! Join the Game of Timers Competition to Win Epic Prizes. Registration is Open. Game starts Mon July 1st.

It is currently 21 Jul 2019, 12:15

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

The average (arithmetic mean) of 16 students first quiz scores in a di

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Manager
Manager
avatar
B
Joined: 13 Sep 2016
Posts: 118
GMAT 1: 800 Q51 V51
The average (arithmetic mean) of 16 students first quiz scores in a di  [#permalink]

Show Tags

New post Updated on: 18 Sep 2016, 02:55
5
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

77% (01:37) correct 23% (01:42) wrong based on 61 sessions

HideShow timer Statistics


The average (arithmetic mean) of 16 students first quiz scores in a difficult English class is 62.5. When one student dropped the class, the average of the remaining scores increased to 64.0. What is the quiz score of the student who dropped the class?

a) 10
b) 25
c) 40
d) 55
e) 70

Originally posted by Nanobotstv on 18 Sep 2016, 02:47.
Last edited by Bunuel on 18 Sep 2016, 02:55, edited 1 time in total.
Renamed the topic and edited the question.
Board of Directors
User avatar
P
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4512
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
GMAT ToolKit User
Re: The average (arithmetic mean) of 16 students first quiz scores in a di  [#permalink]

Show Tags

New post 18 Sep 2016, 03:07
1
1
alanforde800Maximus wrote:
The average (arithmetic mean) of 16 students first quiz scores in a difficult English class is 62.5. When one student dropped the class, the average of the remaining scores increased to 64.0. What is the quiz score of the student who dropped the class?

a) 10
b) 25
c) 40
d) 55
e) 70


Total Score of 16 students is 16*62.50 = 1000

Total Score of 15 students is 15*64 = 960

So, the score of the person who left is 40 ( 1000 - 960 )

Answer will be (C)

_________________
Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )
Current Student
avatar
Joined: 08 Jun 2013
Posts: 33
Re: The average (arithmetic mean) of 16 students first quiz scores in a di  [#permalink]

Show Tags

New post 18 Sep 2016, 05:00
score of 16 students = 16*avg arithmetic mean = 16*62.5 = 1000
score of 15 students = 15*64 = 960
diff = 40
answer is c
EMPOWERgmat Instructor
User avatar
V
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 14603
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: The average (arithmetic mean) of 16 students first quiz scores in a di  [#permalink]

Show Tags

New post 28 Jan 2018, 14:25
3
Hi All,

This question is a 'weighted average' question that gives you all of the numbers to work with, so solving it with arithmetic (the way that Mitch did) is a pretty standard approach for this type of prompt. There's a built-in concept that you can take advantage of to save some time though.

The one score that was removed from the total was small enough that it raised the average of the remaining 15 scores from a 62.5 to a 64. That 1.5 point increase per person, in total, would be (1.5)(15) = 22.5 points.

So the removed score had to be 22.5 points lower than the original average: 62.5 - 22.5 = 40.

Final Answer:

GMAT assassins aren't born, they're made,
Rich
_________________
760+: Learn What GMAT Assassins Do to Score at the Highest Levels
Contact Rich at: Rich.C@empowergmat.com

*****Select EMPOWERgmat Courses now include ALL 6 Official GMAC CATs!*****

Rich Cohen

Co-Founder & GMAT Assassin

Special Offer: Save $75 + GMAT Club Tests Free
  Official GMAT Exam Packs + 70 Pt. Improvement Guarantee
www.empowergmat.com/
Manager
Manager
avatar
G
Joined: 19 Apr 2017
Posts: 138
Concentration: General Management, Sustainability
Schools: ESSEC '22
GPA: 3.9
WE: Operations (Hospitality and Tourism)
Re: The average (arithmetic mean) of 16 students first quiz scores in a di  [#permalink]

Show Tags

New post 05 Mar 2019, 11:50
Sum of scores of 16 students = 62.5 * 16
Sum of scores of 15 students = 64 * 15

Sum of score of the student who left = 62.5 * 16 - 64 * 15= 16(62.5-60) = 16(2.5) = 40

To shorten the calculation *64 = 2x2x4x4 -> so you can take 16 common
GMAT Club Bot
Re: The average (arithmetic mean) of 16 students first quiz scores in a di   [#permalink] 05 Mar 2019, 11:50
Display posts from previous: Sort by

The average (arithmetic mean) of 16 students first quiz scores in a di

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





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