the mean of 40 observation was 160 it was detected on rechecking that the value 165 was wrongly copied as 125 for computation of mean find the correct mean
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mean of 40 observation=160
sum of 40 students =160×40
=6400
difference in wrongly written number=165-125
=40
now it's sum must be greater as it was wrongly writeen with difference of 40
now sum of number =6400+40=6440
number of observations=40
new mean =6440/40
=161
sum of 40 students =160×40
=6400
difference in wrongly written number=165-125
=40
now it's sum must be greater as it was wrongly writeen with difference of 40
now sum of number =6400+40=6440
number of observations=40
new mean =6440/40
=161
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