Mean of a observation is 35 . later it was detucted that an observation81 was misread as 18 . Find the correct mean of observation
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Mean of 9 observations = 35 (Given)
Sum of 9 observations = 35×9
Sum of 9 observations =315
since 81 was misread as 18
Then, sum of new observations =[315- (wrong observation)+(correct observation)]
= 315-18+81
= 315+63= 378
The correct mean = some of new observation/total number of observations
Correct mean= 378/9= 42
Hence, the correct mean is 42.
Hope this will help you..
Sum of 9 observations = 35×9
Sum of 9 observations =315
since 81 was misread as 18
Then, sum of new observations =[315- (wrong observation)+(correct observation)]
= 315-18+81
= 315+63= 378
The correct mean = some of new observation/total number of observations
Correct mean= 378/9= 42
Hence, the correct mean is 42.
Hope this will help you..
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