the mean of 40 observations is 160. it was detected on rechecking that 165 is copied as 125 for computation of mean. find the correct mean
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Here n=40, Mean=160
Sum of numbers=160×40=6400
Therefore, incorrect sum of the observations=6400.
Correct sum=Incorrect sum- Incorrect mean + Correct mean
=6400-125+165 = 6440
Correct mean= Correct sum ÷ n
=6440÷ 40
=161.
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