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DS- mean question

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Intern
Intern
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Joined: 14 Jan 2009
Posts: 13

Kudos [?]: 4 [0], given: 9

Schools: Texas, Foster (washington) UNC
DS- mean question [#permalink]

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New post 26 Feb 2009, 22:28
00:00
A
B
C
D
E

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(N/A)

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

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can someone please help me out with this?
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Kudos [?]: 4 [0], given: 9

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Senior Manager
Senior Manager
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Joined: 08 Jan 2009
Posts: 326

Kudos [?]: 175 [1], given: 5

Re: DS- mean question [#permalink]

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New post 26 Feb 2009, 23:40
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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.

Kudos [?]: 175 [1], given: 5

Current Student
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Joined: 03 Aug 2006
Posts: 115

Kudos [?]: 294 [0], given: 3

Location: Next to Google
Schools: Haas School of Business
Re: DS- mean question [#permalink]

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New post 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.

Kudos [?]: 294 [0], given: 3

Re: DS- mean question   [#permalink] 27 Feb 2009, 13:01
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