Question

the mean of 40observations was 160.it was detected on rechecking that the value of 165 was wrongly copied as 125 for computation of mean.find the correct mean.

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Answer 1

Answer:

sum of X=160×4=6400

sum of Xc=sum of X+correct value–incorrect value

sum of Xc=6400+165–125

=6440

Mean =sum of Xc/N

Mean=6440/40

Mean=161

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