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# The incomplete table above shows a distribution of scores for a class

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Senior PS Moderator
Joined: 26 Feb 2016
Posts: 3343
Location: India
GPA: 3.12
The incomplete table above shows a distribution of scores for a class  [#permalink]

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15 Oct 2018, 11:07
00:00

Difficulty:

25% (medium)

Question Stats:

67% (01:58) correct 33% (01:42) wrong based on 36 sessions

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Attachment:

Class_Incomplete.JPG [ 13.48 KiB | Viewed 350 times ]

The incomplete table above shows a distribution of scores for a class of 20 students. If the average
(arithmetic mean) score for the class is 78, what score is missing from the table?

A. 73
B. 75
C. 77
D. 79
E. 81

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Joined: 02 Aug 2009
Posts: 7335
Re: The incomplete table above shows a distribution of scores for a class  [#permalink]

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15 Oct 2018, 17:57
pushpitkc wrote:
Attachment:
Class_Incomplete.JPG

The incomplete table above shows a distribution of scores for a class of 20 students. If the average
(arithmetic mean) score for the class is 78, what score is missing from the table?

A. 73
B. 75
C. 77
D. 79
E. 81

Total sum as per average of the class = 20*78=1560

Total sum as per the distribution of marks = 83*5+70*6+92*3+5x+64=415+420+276+64+5x=1175+5x

Both have to be same
So 1175+5x=1560.....5x=385....x=77

C
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2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html
4) Base while finding % increase and % decrease : https://gmatclub.com/forum/percentage-increase-decrease-what-should-be-the-denominator-287528.html

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Re: The incomplete table above shows a distribution of scores for a class   [#permalink] 15 Oct 2018, 17:57
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