Question

The mean of 100 observations was 40. It was found later on that one of the observation was misread as 83 in place of 53. The correct mean is

Answer 1

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Answer 2

Let sum of observation be x (including 83) then x-(83-53)/100=40 x-30/100=40 (100 on other side)
x-30=4000 x=4000+30 x=4030 correct mean is x/100 4030/100 mean=40.30