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15 Jul 2018, 08:37
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
88% (01:04) correct
12%
(01:16)
wrong
based on 57
sessions
History
Date
Time
Result
Not Attempted Yet
When 9 students took a zoology quiz with a possible score of 0 to 10, inclusive, there average (arithmetic mean) score was 7.5. If a tenth student takes the same quiz, what will be the least possible average score on the quiz for all 10 students?
A. 6.5
B. 6.75
C. 7.0
D. 7.25
E. 7.5
A. 6.5
B. 6.75
C. 7.0
D. 7.25
E. 7.5
15 Jul 2018, 10:27
Kudos
Bookmarks
+1 for B.
Avg of score of 9 students = 7.5
Sum of scores of 9 students = 7.5 * 9 = 67.5
To minimize the avg score of 10 students, 10th student should score the least i.e, 0
Therefore,
Sum of scores of 10 students 67.5 + 0 = 67.5
Average score of 10 students = Sum of scores of 10 students / 10
= 67.5/10
= 6.75
Hence, B.
Avg of score of 9 students = 7.5
Sum of scores of 9 students = 7.5 * 9 = 67.5
To minimize the avg score of 10 students, 10th student should score the least i.e, 0
Therefore,
Sum of scores of 10 students 67.5 + 0 = 67.5
Average score of 10 students = Sum of scores of 10 students / 10
= 67.5/10
= 6.75
Hence, B.
15 Jul 2018, 10:33
Kudos
Bookmarks
Bunuel
Total score of 9 students = 7.5 *9 = 67.5.
We are asked to find out the least average score of 10 students.
Assume no. 10 students score 0.
Total of 10 students score = 67.5 + 0 =67.5
Average score of 10 students = 67.5 /10
= 6.75
Option B is the answer.
