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

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

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New post 15 Oct 2018, 11:07
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A
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Difficulty:

  25% (medium)

Question Stats:

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

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Class_Incomplete.JPG
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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Re: The incomplete table above shows a distribution of scores for a class  [#permalink]

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New post 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

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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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