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What was the average (arithmetic mean) score for all the freshmen and

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What was the average (arithmetic mean) score for all the freshmen and  [#permalink]

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New post 31 Jan 2019, 23:56
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A
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C
D
E

Difficulty:

  35% (medium)

Question Stats:

72% (01:50) correct 28% (02:23) wrong based on 31 sessions

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Score results on a college mathematics proficiency exam
FreshmenSophomores
Number of students taking the exam12080
Average (arithmetic mean) score on the exam78 points84 points

What was the average (arithmetic mean) score for all the freshmen and sophomores taking the exam? Give your answer rounded to the nearest 0.1 points.

A. 78
B. 80
C. 80.2
D. 80.4
E. 80.8

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Re: What was the average (arithmetic mean) score for all the freshmen and  [#permalink]

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New post 01 Feb 2019, 00:09
Bunuel wrote:
Score results on a college mathematics proficiency exam
FreshmenSophomores
Number of students taking the exam12080
Average (arithmetic mean) score on the exam78 points84 points


What was the average (arithmetic mean) score for all the freshmen and sophomores taking the exam? Give your answer rounded to the nearest 0.1 points.

A. 78
B. 80
C. 80.2
D. 80.4
E. 80.8


Average of all the students \(= \frac{(120*78)+(80*84)}{(120+80)} = 80.4\)

Answer: Option D
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Re: What was the average (arithmetic mean) score for all the freshmen and  [#permalink]

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New post 01 Feb 2019, 00:10
(120*78+40*84)/(120+80)=80.4

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Re: What was the average (arithmetic mean) score for all the freshmen and  [#permalink]

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New post 01 Feb 2019, 11:46
Bunuel wrote:
Score results on a college mathematics proficiency exam
FreshmenSophomores
Number of students taking the exam12080
Average (arithmetic mean) score on the exam78 points84 points

What was the average (arithmetic mean) score for all the freshmen and sophomores taking the exam? Give your answer rounded to the nearest 0.1 points.

A. 78
B. 80
C. 80.2
D. 80.4
E. 80.8



120 * 78 + 80 * 84/ 200
IMO D
80.4
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Re: What was the average (arithmetic mean) score for all the freshmen and   [#permalink] 01 Feb 2019, 11:46
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