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The graph above shows the distribution of test scores for a certain

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Math Expert
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Joined: 02 Sep 2009
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The graph above shows the distribution of test scores for a certain  [#permalink]

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New post 31 Jan 2018, 07:28
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

79% (01:36) correct 21% (02:07) wrong based on 85 sessions

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Senior Manager
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Concentration: Operations, Strategy
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Re: The graph above shows the distribution of test scores for a certain  [#permalink]

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New post 31 Jan 2018, 07:39
A

Total score = 5*70 + 20*80 + 10*90 + 15*100
= 4350

Total number of students = 5+20+10+15 =50

Average = 4350/50 = 87


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Re: The graph above shows the distribution of test scores for a certain  [#permalink]

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New post 10 Mar 2018, 20:28
Bunuel wrote:
Image
The graph above shows the distribution of test scores for a certain class. What was the average (arithmetic mean) score?

(A) 87

(B) 81

(C) 80

(D) 78

(E) 75


Attachment:
2018-01-31_1826.png


I was able to answer the question by the conventional way as explained by Sasindran above and I also understand that since it is sub 600 level it got to have this type of calculation. I am just wondering if there are some other ways too to solve the question.
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Re: The graph above shows the distribution of test scores for a certain  [#permalink]

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New post 10 Mar 2018, 21:27
Total score = 5*70 + 20*80 + 10*90 + 15*100= 4350

Total number of students= 5+20+10+15 =50

Average= \(\frac{4350}{50}\)= 87

Answer: A.
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Re: The graph above shows the distribution of test scores for a certain   [#permalink] 10 Mar 2018, 21:27
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