the mean of 40 observation was 160 it was detected only checking that the value 165 was wrongly copy as 125 for computation of mean find the correct mean
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mean = sum of observation / total no of observation
A/Q
160 = sum of all observation/40
6400 = X1 +X2 +.... + 125 ... X40
6400 - 125 = sum of remaining observation
or sum of remaining observation = 6275
new and correct mean =sum of correct observation/ total no of observationt
mean = 6275 + 165 / 40
=6440/40 = 161
hence new and correct mean = 161
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