Question:The mean of `100`observations was calculated as `40`.It was found later on that one of the observations was misread as `83` instead of `53`.The correct mean is : 

A `39` 
B `39.7` 
C `40.3` 
D `42.7` 

+ Answer
B 

+ Explanation
Correct sum 

`= (40 xx 100 + 53 - 83)`

`= 3970`.

:. Correct mean 

`= 3970/100`

`= 39.7`

+ Report

Irin Moni

Editor, VCampus

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