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The marks (maximum marks 100) obtained b...

The marks (maximum marks 100) obtained by 20 students in a test are given below :

Find the mean marks of the 20 students.

A

64

B

64.5

C

54

D

54.5

Text Solution

Verified by Experts

The correct Answer is:
B
The mean
`(bar(x))=(sum f_(i)x_(i))/(N (or) sum f)=((40xx3)+(55xx4)+(60xx2)+(70xx5)(75xx4)(85xx1)+(95xx1))/(20)`
`=1290/20=6.45`
`:.` The mean marks of the 20 students `=64.5`
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