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

It is currently 29 Aug 2016, 08:07
GMAT Club Tests

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

A students average (arithmetic mean) test score on 4 tests

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

Hide Tags

Intern
Intern
avatar
Joined: 08 Nov 2008
Posts: 29
Followers: 0

Kudos [?]: 28 [0], given: 0

A students average (arithmetic mean) test score on 4 tests [#permalink]

Show Tags

New post 11 Nov 2008, 13:33
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

92% (01:23) correct 8% (00:15) wrong based on 103 sessions

HideShow timer Statistics

A student's average (arithmetic mean) test score on 4 tests is 78. What must be the student's score on a 5th test for the student's average score on the 5 tests to be 80?

(A) 80
(B) 82
(C) 84
(D) 86
(E) 88

OPEN DISCUSSION OF THIS QUESTION IS HERE: a-student-s-average-arithmetic-mean-test-score-on-4-tests-137873.html
[Reveal] Spoiler: OA
3 KUDOS received
SVP
SVP
User avatar
Joined: 30 Apr 2008
Posts: 1888
Location: Oklahoma City
Schools: Hard Knocks
Followers: 39

Kudos [?]: 538 [3] , given: 32

Re: student's score [#permalink]

Show Tags

New post 11 Nov 2008, 13:39
3
This post received
KUDOS
E. 88

The student must score at least an 80 for sure. If he scores an 8, then he will need to score 2 pots for each of the 4 other tests to "make up" the difference. They each were at 78 (at least the average is, but this is a small point and doesn't matter to the answer). So 4 tests that were each 2 points short of the 80 average that is desired means the next test must be 8 points higher than the desired average, so 80+8 = 88.

petercao wrote:
A student’s average (arithmetic mean) test score on 4 tests is 78. What must be the student’s score on a 5th test for the student’s average score on the 5 tests to be 80?

A. 80
B. 82
C. 84
D. 86
E. 88

_________________

------------------------------------
J Allen Morris
**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

GMAT Club Premium Membership - big benefits and savings

1 KUDOS received
Manager
Manager
avatar
Joined: 02 Nov 2009
Posts: 138
Followers: 2

Kudos [?]: 132 [1] , given: 97

Re: student's score [#permalink]

Show Tags

New post 26 Feb 2011, 22:35
1
This post received
KUDOS
Step 1) Total -= Average* number

total = 78*4 =312

Step 2) T = A*N
4th test + 5th = total
312 +5th test = (80*5)
5th test = 400-312 =88

testing on Total = A*n
Manager
Manager
avatar
Joined: 18 Jan 2011
Posts: 231
Followers: 1

Kudos [?]: 33 [0], given: 4

Re: student's score [#permalink]

Show Tags

New post 09 Apr 2011, 15:43
avg on 4 is 78, in order to increase the avg to 80, the new number should be able to contribute 2 to each of the existing 4 numbers i.e. 8 in total so 88.
_________________

Good Luck!!!

***Help and be helped!!!****

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 11126
Followers: 511

Kudos [?]: 134 [0], given: 0

Premium Member
Re: A students average (arithmetic mean) test score on 4 tests [#permalink]

Show Tags

New post 13 Sep 2013, 07:52
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.
_________________

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

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 34492
Followers: 6293

Kudos [?]: 79829 [0], given: 10022

Re: A students average (arithmetic mean) test score on 4 tests [#permalink]

Show Tags

New post 13 Sep 2013, 08:52
A student's average (arithmetic mean) test score on 4 tests is 78. What must be the student's score on a 5th test for the student's average score on the 5 tests to be 80?

(A) 80
(B) 82
(C) 84
(D) 86
(E) 88

Since the student's average test score on 4 tests is 78, then the sum of the first 4 test scores is 4*78=312. We need the sum of ALL 5 scores to be 5*80=400, so if \(x\) is the 5th test score, then \(312+x=400\) --> \(x=88\).

Answer: E.

OPEN DISCUSSION OF THIS QUESTION IS HERE: a-student-s-average-arithmetic-mean-test-score-on-4-tests-137873.html
_________________

New to the Math Forum?
Please read this: All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Re: A students average (arithmetic mean) test score on 4 tests   [#permalink] 13 Sep 2013, 08:52
    Similar topics Author Replies Last post
Similar
Topics:
1 The average (arithmetic mean) score on a test taken by 10 students was AbdurRakib 1 15 Jun 2016, 01:18
1 Experts publish their posts in the topic Joe’s average (arithmetic mean) test score across 4 equally weighted Bunuel 3 07 Feb 2016, 10:56
1 Experts publish their posts in the topic Jerry’s average (arithmetic mean) score on the first 3 of 4 tests is 8 Bunuel 5 27 Dec 2015, 09:12
13 Experts publish their posts in the topic 20 students took the test. The arithmetic mean of the scores guerrero25 5 04 Aug 2013, 04:00
8 Experts publish their posts in the topic A student's average (arithmetic mean) test score on 4 tests Bunuel 16 26 Aug 2012, 03:07
Display posts from previous: Sort by

A students average (arithmetic mean) test score on 4 tests

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| 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®.