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DS-Average

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Director
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DS-Average [#permalink] New post 11 Dec 2005, 09:21
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (01:48) correct 0% (00:00) wrong based on 1 sessions
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SVP
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Re: DS-Average [#permalink] New post 11 Dec 2005, 11:41
E. need actual number or ratio of students in classses A and B.
Intern
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 [#permalink] New post 11 Dec 2005, 11:46
Since Average of class A is given, we can consider this as ONE entity

Statement 1: Average of class B is given. Thus we can consider this as ONE entity.
We need to find the average of these TWO entities.
[Ave(A) + Ave(B)]/2 should do it.

Statement 2: Insuff, since we dont know number of students for class A

Answer = A
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 [#permalink] New post 12 Dec 2005, 06:34
blshah wrote:
[Ave(A) + Ave(B)]/2 should do it.

that is flawed. you cannot average as above.

when you donot have ratio of A and B or their numbers, you cannot simply average the averages of A and B. you could do if A and B are equal.
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 [#permalink] New post 12 Dec 2005, 06:41
We need to know the total numbers of students to get the overall average.

Both statements together insuff.

(E)
  [#permalink] 12 Dec 2005, 06:41
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