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

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Math Expert
Joined: 02 Sep 2009
Posts: 53066
What was the average (arithmetic mean) score for all the freshmen and  [#permalink]

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31 Jan 2019, 22:56
00:00

Difficulty:

35% (medium)

Question Stats:

75% (02:06) correct 25% (01:49) wrong based on 14 sessions

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Score results on a college mathematics proficiency exam
 Freshmen Sophomores Number of students taking the exam 120 80 Average (arithmetic mean) score on the exam 78 points 84 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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31 Jan 2019, 23:09
Bunuel wrote:
Score results on a college mathematics proficiency exam
 Freshmen Sophomores Number of students taking the exam 120 80 Average (arithmetic mean) score on the exam 78 points 84 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 $$= \frac{(120*78)+(80*84)}{(120+80)} = 80.4$$

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

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31 Jan 2019, 23:10
(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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01 Feb 2019, 10:46
Bunuel wrote:
Score results on a college mathematics proficiency exam
 Freshmen Sophomores Number of students taking the exam 120 80 Average (arithmetic mean) score on the exam 78 points 84 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, 10:46
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