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The table above shows the distribution of scores on a geography quiz

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The table above shows the distribution of scores on a geography quiz  [#permalink]

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New post Updated on: 07 Apr 2018, 11:40
1
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

69% (01:35) correct 31% (01:31) wrong based on 107 sessions

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The table above shows the distribution of scores on a geography quiz given to a class of 25 students. Which of the following is closest to the average (arithmetic mean) quiz score for the class?

A. 8.6
B. 8.5
C. 8.4
D. 8.3
E. 8.0

Attachment:
gmat quiz question.JPG
gmat quiz question.JPG [ 14.5 KiB | Viewed 3884 times ]

Originally posted by hmazariegos on 07 Apr 2018, 11:09.
Last edited by Bunuel on 07 Apr 2018, 11:40, edited 1 time in total.
Edited the question and added the options.
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Re: The table above shows the distribution of scores on a geography quiz  [#permalink]

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New post 07 Apr 2018, 11:14
Here is how i solved it:

(6*2) + (7*4) + (8*7) + (9*9) + (10*3) / (2 + 4 + 7 + 9 + 3)

207 / 25 = 8.28 ~ 8.3 hence answer is "D"
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Re: The table above shows the distribution of scores on a geography quiz  [#permalink]

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New post 09 Oct 2019, 20:09
1
hmazariegos wrote:
Image
The table above shows the distribution of scores on a geography quiz given to a class of 25 students. Which of the following is closest to the average (arithmetic mean) quiz score for the class?

A. 8.6
B. 8.5
C. 8.4
D. 8.3
E. 8.0

Attachment:
gmat quiz question.JPG


Using the weighted average formula, we have:

(6 x 2 + 7 x 4 + 8 x 7 + 9 x 9 + 10 x 3)/25

(12 + 28 + 56 + 81 + 30)/25

207/25 = 8.28, which is about 8.3.

Answer: D
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Re: The table above shows the distribution of scores on a geography quiz   [#permalink] 09 Oct 2019, 20:09
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