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The average of marks of 28 students in M...

The average of marks of 28 students in Mathematics was 50, 8 students left the school, then this average increased by 5. What is the average of marks obtained by the students who left the school?

A

50.5

B

37.5

C

42.5

D

45

Text Solution

Verified by Experts

The correct Answer is:
B
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The average of marks of 28 students in Mathematics was 50. Eight students left the school and then this average increased by 5. what is the average of marks obtained by the students who left the school ?

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The average marks obtained by a group of 25 students was 29. One student left the group as a result of which the average of the remaining students rose to 29.5. Afterwards, another student came in as a result of which the average marks of the group dropped to 28.8. What is the average of the combined marks obtained by the student who left and the one who joined? Options are (a) 14 (b) 14.5 (c) 15 (d) 13.5 .