Students in five sections, F, G, H, J and K, of an : GMAT Data Sufficiency (DS)
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# Students in five sections, F, G, H, J and K, of an

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Students in five sections, F, G, H, J and K, of an [#permalink]

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23 Apr 2007, 09:09
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Students in five sections, F, G, H, J and K, of an introductory accounting course were
given a final exam. What is the average test score on all the students in the five
sections ?

(1) The average of the final exam scores of students in sections F, G, and H was 72.
(2) The average of the final exam scores of students in sections J and K was 78.
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23 Apr 2007, 09:31
andrehaui wrote:
Students in five sections, F, G, H, J and K, of an introductory accounting course were
given a final exam. What is the average test score on all the students in the five
sections ?

(1) The average of the final exam scores of students in sections F, G, and H was 72.
(2) The average of the final exam scores of students in sections J and K was 78.

Satement1->(F+G+H)/3=72
hence F+G+H=216.
We don't have any information about J and K. So insufficient

Statement2->J+K=156. so this statement is also insufficient.

Both the statements to combine is sufficient and hence answere is C.

Javed.

Cheers!
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23 Apr 2007, 11:02
Students in five sections, F, G, H, J and K, of an introductory accounting course were
given a final exam. What is the average test score on all the students in the five
sections ?

(1) The average of the final exam scores of students in sections F, G, and H was 72.
(2) The average of the final exam scores of students in sections J and K was 78.

Statement1: Total scores of section F,G and H are = 72*3 = 216
No clue for the average score for the all students. So INSUFF

Statement2: Total scores of section J and K are = 78*2 = 156
No clue for the average score for the all students. So INSUFF

Putting them together:
Total scores of the students in all five sections = 216+156=372
The average score of the all students in all sections = total scores od all students/ Total number od students in all sections
Here total number od students in all sections is not known.
So INSUFF

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23 Apr 2007, 12:48
andrehaui wrote:
Students in five sections, F, G, H, J and K, of an introductory accounting course were
given a final exam. What is the average test score on all the students in the five
sections ?

(1) The average of the final exam scores of students in sections F, G, and H was 72.
(2) The average of the final exam scores of students in sections J and K was 78.

Answe is E:

avg score = total score/total nos of students.

Since the information for "total score" or "total nos of students" cannot be obtained from the individual statements or after combining them, the given information is not sufficeint and henc eE
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23 Apr 2007, 18:07
Looking at the statments, we need E. Both lacks the final piece of clue - # of students. No need for more workings.
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23 Apr 2007, 20:07
well this question got me at the frist but now the picture is more clear its E.

Javed.

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17 Aug 2010, 00:53
Also looking at the statments, we need E. Both lacks the final piece of clue - # of students. No need for more workings.
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10 Oct 2010, 15:08
BlitzHN wrote:
C

yeah, actually E. no data on num of students.
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Re: stats   [#permalink] 10 Oct 2010, 15:08
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