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

It is currently 29 Aug 2014, 04:23

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

The mean of four integers will not change if all the

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
SVP
SVP
avatar
Joined: 04 May 2006
Posts: 1941
Schools: CBS, Kellogg
Followers: 16

Kudos [?]: 274 [0], given: 1

Premium Member CAT Tests
The mean of four integers will not change if all the [#permalink] New post 14 May 2008, 02:13
The mean of four integers will not change if all the integers are multiplied by any constant. What is always true about this set of numbers?

I. The mean of the set is 0

II. The sum of the largest member and the smallest member of the set is 0

III. The set contains both positive and negative integers



I only
II only
III only
I and II only
I, II, and III
_________________

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Expert Post
CEO
CEO
User avatar
Joined: 17 Nov 2007
Posts: 3571
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 357

Kudos [?]: 1753 [0], given: 358

GMAT ToolKit User GMAT Tests User Premium Member
Re: M12-30 [#permalink] New post 14 May 2008, 03:15
Expert's post
I guess I and III, but this onption is not included here.

I. if we write out the formula of mean, we can easily find that mean has to be 0

II. {-3,-1, 0,4} satisfies the condition, but the sum of the largest member and the smallest member of the set is 4-3=1

III. A set of something means in GMAT non repetitive list. So, the set has to contain positive and negative integers to have the mean=0. {0,0,0,0} - is not a set in GMAT.
_________________

HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | PrepGame

Current Student
avatar
Joined: 28 Dec 2004
Posts: 3405
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 158 [0], given: 2

GMAT Tests User
Re: M12-30 [#permalink] New post 14 May 2008, 04:09
i think its 1 only..

we could have all 0s in the set as well..

{0,0,0} where the mean=0

sum of largest+smallest=0..

and it doesnt have to have negative or positive integers..
Expert Post
CEO
CEO
User avatar
Joined: 17 Nov 2007
Posts: 3571
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 357

Kudos [?]: 1753 [0], given: 358

GMAT ToolKit User GMAT Tests User Premium Member
Re: M12-30 [#permalink] New post 14 May 2008, 05:26
Expert's post
the question about set is still open for me (look at 7-t61572)

I have not seen so far at least one real GMAT problem that tests the set concept. So, I think that problems like this one do not reflect real GMAT.
_________________

HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | PrepGame

Current Student
avatar
Joined: 28 Dec 2004
Posts: 3405
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 158 [0], given: 2

GMAT Tests User
Re: M12-30 [#permalink] New post 14 May 2008, 06:06
walker wrote:
the question about set is still open for me (look at 7-t61572)

I have not seen so far at least one real GMAT problem that tests the set concept. So, I think that problems like this one do not reflect real GMAT.


i remember having this issue at college in Computer sci..sets contain unique different integers..however mathematically a set can have repeating numbers..i believe OG prefers the mathematical definition
SVP
SVP
avatar
Joined: 04 May 2006
Posts: 1941
Schools: CBS, Kellogg
Followers: 16

Kudos [?]: 274 [0], given: 1

Premium Member CAT Tests
Re: M12-30 [#permalink] New post 15 May 2008, 20:10
Thanks Walker and fresinha12. Your reasoning really helps me out on this, and ofcourse be better than OE. :lol:

OA is A
_________________

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: M12-30   [#permalink] 15 May 2008, 20:10
    Similar topics Author Replies Last post
Similar
Topics:
1 Change in meaning score780 1 17 Mar 2013, 14:01
What is the mean of four consecutive even integers a , b , c Economist 8 25 Oct 2009, 10:53
1 What is the mean of four consecutive even integers a , b , c Economist 1 24 Sep 2009, 07:43
What is the mean of four consecutive even integers a , b , c nikhilpoddar 3 03 Sep 2009, 15:35
7 Experts publish their posts in the topic The mean of four integers will not change if all the integer arjtryarjtry 12 11 Sep 2008, 21:10
Display posts from previous: Sort by

The mean of four integers will not change if all the

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| 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®.