What is Average Height? (GMATPrep)

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RadiumBall: Master | Next Rank: 500 Posts; Posts: 132; Joined: Thu Dec 02, 2010 2:49 am; Thanked: 5 times

by RadiumBall » Sun Mar 27, 2011 7:31 am

What is Average 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 5/2 inches, and the average height of the rest of the people in the group is 5 feet 10 inches

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

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Source: Beat The GMAT — Data Sufficiency | Sun Mar 27, 2011 7:31 am

vineeshp: Legendary Member; Posts: 965; Joined: Thu Jan 28, 2010 12:52 amFollowed by: 34 members; Thanked: 156 times; GMAT Score:720

by vineeshp » Sun Mar 27, 2011 8:00 am

OA is A? Explanation follows.

Stmt 1:

((n/3)* average1 + (2n/3) * average2) / n

N cancels out and hence we can get the answer.

Stmt 2:

Total / n. Cannot be solved to get the right value.

A.

Vineesh,
Just telling you what I know and think. I am not the expert.

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HSPA: Legendary Member; Posts: 1101; Joined: Fri Jan 28, 2011 7:26 amFollowed by: 13 members; Thanked: 47 times; GMAT Score:640

by HSPA » Sun Mar 27, 2011 8:01 am

B) is giving 178/n... we cannot use it as n is unknown

A) is okay

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vineeshp: Legendary Member; Posts: 965; Joined: Thu Jan 28, 2010 12:52 amFollowed by: 34 members; Thanked: 156 times; GMAT Score:720

by vineeshp » Sun Mar 27, 2011 8:02 am

Very happy to post in my 100th post that I got that one all wrong. Reworking.

Vineesh,
Just telling you what I know and think. I am not the expert.

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vineeshp: Legendary Member; Posts: 965; Joined: Thu Jan 28, 2010 12:52 amFollowed by: 34 members; Thanked: 156 times; GMAT Score:720

by vineeshp » Sun Mar 27, 2011 8:07 am

Actually I am confused. How many people are there in the group? n or n is a subset of the group?

I intially thought n is the total number of people in the group and we get A. Straightforward.

But are there more people in n? "of the n people in a certain group" seems to suggest so. :S

Vineesh,
Just telling you what I know and think. I am not the expert.

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RadiumBall: Master | Next Rank: 500 Posts; Posts: 132; Joined: Thu Dec 02, 2010 2:49 am; Thanked: 5 times

by RadiumBall » Sun Mar 27, 2011 8:17 pm

Cool did not think it is so cheap. OA: A

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force5: Legendary Member; Posts: 582; Joined: Tue Mar 08, 2011 12:48 amFollowed by: 6 members; Thanked: 61 times; GMAT Score:740

by force5 » Mon Mar 28, 2011 12:02 am

i hope all doubts are gone. answer is A

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