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# DS- mean question

Author Message
Intern
Joined: 14 Jan 2009
Posts: 13
Schools: Texas, Foster (washington) UNC

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26 Feb 2009, 22:28
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

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Senior Manager
Joined: 08 Jan 2009
Posts: 317

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26 Feb 2009, 23:40
1
KUDOS
Given :

n = Number of people in the group.

Stmt 1:
Number of Tall people = n/3 and avg ht = 6ft 2.5 inch
Rest of the people = n-n/3 = 2n/3 avg ht = 5ft 10inch.

So avg ht of n people = (n/3 ( 6ft 2.5 inch ) + 2n/3( 5ft 10 inch))/ n Sufficient.

Stmt 2:

sum of the ht of N people = 178ft 9 inch . Need to the value of n. Not sufficient.

Hence A.
Current Student
Joined: 03 Aug 2006
Posts: 112

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27 Feb 2009, 13:01
I also agree with 'A'.

n gets canceled out when solving the equation based on Statement 1 giving you the answer. Statement 2 does not give you a value for n.
Re: DS- mean question   [#permalink] 27 Feb 2009, 13:01
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