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Question

The mean marks of 100 students were found to be 40. Later on, it was discovered that a score of 53 was misread as 83. Then, the correct mean will be:


A

37.5

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B

35.6

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C

39.7

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D

38.7

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Solution

The correct option is C

39.7


Mean =40
and number of students = 100 [given]
Total marks =40×100
=4000
The correct sum of observations
=4000(8353)=400030=3970
Correct mean =3970100
=39.7


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