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

It is currently 23 Oct 2014, 01:09

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

What is the average (arithmetic mean) height of the n people

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 04 May 2009
Posts: 132
Location: London
Schools: Haas (WL), Kellogg (matricultating), Stanford (R2, ding), Columbia (ding)
WE 1: 3 years hotel industry sales and marketing France
WE 2: 3 years financial industry marketing UK
Followers: 2

Kudos [?]: 20 [0], given: 10

What is the average (arithmetic mean) height of the n people [#permalink] New post 21 Mar 2010, 09:49
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

80% (01:11) correct 20% (01:11) wrong based on 11 sessions
What is the average (arithmetic mean) height of the n people in a certain group?

(1) The average height of the n/3 tallest people in the group is 6 feet 2(1/2) inches, and the average height of the rest of the people in the group is 5 feet 10 inches.

(2) The sum of the heightsof the n people is 178 feet 9 inches.


OA =
[Reveal] Spoiler:
A

_________________

Yes I can!

Senior Manager
Senior Manager
User avatar
Joined: 13 Dec 2009
Posts: 264
Followers: 10

Kudos [?]: 111 [0], given: 13

Reviews Badge
Re: Average question [#permalink] New post 21 Mar 2010, 10:35
nifoui wrote:
What is the average (arithmetic mean) height of the n people in a certain group?

(1) The average height of the n/3 tallest people in the group is 6 feet 2(1/2) inches, and the average height of the rest of the people in the group is 5 feet 10 inches.

(2) The sum of the heightsof the n people is 178 feet 9 inches.


OA =
[Reveal] Spoiler:
A

Stmt1: Avg of n/3 people= 6feet 2(1/2) inches = n/3 * 6feet 2(1/2) inches
Avg of 2n/3 people = 5feet 10 inches = 2n /3*5feet 10 inches
If we add both above quantities and divide it by n we will get the avg since n will cancel out. So, sufficient.

Stmt2: if sum is given to calculate avg we have to divide it by n. But we dont know the value of n so insufficient.
Hence A is the answer
_________________

My debrief: done-and-dusted-730-q49-v40

Manager
Manager
avatar
Joined: 04 May 2009
Posts: 132
Location: London
Schools: Haas (WL), Kellogg (matricultating), Stanford (R2, ding), Columbia (ding)
WE 1: 3 years hotel industry sales and marketing France
WE 2: 3 years financial industry marketing UK
Followers: 2

Kudos [?]: 20 [0], given: 10

Re: Average question [#permalink] New post 21 Mar 2010, 11:21
Makes sense indeed, thanks!
_________________

Yes I can!

Intern
Intern
avatar
Joined: 17 Sep 2009
Posts: 3
Followers: 0

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

Re: Average question [#permalink] New post 21 Mar 2010, 12:40
IMO E....from the information provided we don't know what N is.
1 KUDOS received
Senior Manager
Senior Manager
User avatar
Joined: 13 Dec 2009
Posts: 264
Followers: 10

Kudos [?]: 111 [1] , given: 13

Reviews Badge
Re: Average question [#permalink] New post 21 Mar 2010, 22:49
1
This post received
KUDOS
Socker121314 wrote:
IMO E....from the information provided we don't know what N is.

but if u see statement 1 you can find out avg without knowing n
Avg = (n/3 * 6feet 2(1/2) inches + 2n /3*5feet 10 inches ) / n
= 1/3 * 6feet 2(1/2) inches + 2 /3*5feet 10 inches
we dont need to convert it and calculate but we can find the value. So answer is A
_________________

My debrief: done-and-dusted-730-q49-v40

Re: Average question   [#permalink] 21 Mar 2010, 22:49
    Similar topics Author Replies Last post
Similar
Topics:
11 Experts publish their posts in the topic What is the average (arithmetic mean) height of the n people zisis 12 14 Jul 2010, 12:35
What is the average (arithmetic mean) height of the n people scorpio7 2 13 Jun 2009, 10:07
What is the ratio of the average (arithmetic mean) height of Achilless 2 18 Aug 2006, 21:56
What is the average (arithmetic mean) height of the n people kimmyg 4 10 Oct 2005, 11:15
2 Experts publish their posts in the topic What is the ratio of the average (arithmetic mean) height of LADodgers 9 05 Nov 2004, 17:38
Display posts from previous: Sort by

What is the average (arithmetic mean) height of the n people

  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®.