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31 Jan 2019, 23:56
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
75% (01:50) correct
25%
(02:23)
wrong
based on 74
sessions
History
Date
Time
Result
Not Attempted Yet
Score results on a college mathematics proficiency exam
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
| Freshmen | Sophomores | |
| Number of students taking the exam | 120 | 80 |
| Average (arithmetic mean) score on the exam | 78 points | 84 points |
A. 78
B. 80
C. 80.2
D. 80.4
E. 80.8
01 Feb 2019, 00:09
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Bunuel
Average of all the students \(= \frac{(120*78)+(80*84)}{(120+80)} = 80.4\)
Answer: Option D
01 Feb 2019, 00:10
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(120*78+40*84)/(120+80)=80.4
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