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05 Jan 2015, 06:54
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B
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Difficulty:
45%
(medium)
Question Stats:
71% (02:18) correct
29%
(02:34)
wrong
based on 534
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Tough and Tricky questions: Word Problems.
The chart above shows the distribution of letter grades for three groups of students on one test. Point values are assigned to the letter grades so that A = 4 points, B = 3 points, C = 2 points, and D = 1 point. Which of the following values is closest to the average (arithmetic mean) grade of students in group 3?
A. 2.2
B. 2.4
C. 2.9
D. 3.1
E. 3.7
Kudos for a correct solution.
Attachment:
2015-01-05_1753.png [ 4.2 KiB | Viewed 14008 times ]
05 Jan 2015, 09:04
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For this one, we only need to calculate the weighted average of the students in group 3.
Two students got an A, 9 got a B, seven got a C and 4 got a D, so the total number of points is 2*4 + 9*2 + 7*2 + 4*1 = 53. With 22 students in total, we get a weighted average of just under 2.5. The Answer is B.
Two students got an A, 9 got a B, seven got a C and 4 got a D, so the total number of points is 2*4 + 9*2 + 7*2 + 4*1 = 53. With 22 students in total, we get a weighted average of just under 2.5. The Answer is B.
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05 Jan 2015, 10:38
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From the chart:
2*4+9*3+7*2+4*1 / 22 (total students in group 3)
= 53 / 22
= 2 9/22 = ~2.4-2.5
B - 2.4
2*4+9*3+7*2+4*1 / 22 (total students in group 3)
= 53 / 22
= 2 9/22 = ~2.4-2.5
B - 2.4
