1.

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

Answer»

Mean * total number of observations = sum of all observations.Sum = 40 *160 = 6400Now we have taken 125 instead of 165 so the sum must be 6440Mean = 6440/40 = 161.



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