1.

Example 2. The mean of 40 observations was 160. It was detected on rechecwas wrongly copied as 125 for computation of mean. Find the correct mearn.that the value of 165

Answer»

Incorrect Mean =X’ = 160

No of observations = 40

Incorrect Sum of observations =sum’= 160 x 40 = 6400

Correct sum of observations = = sum’ – 125 +165

= 6400 +40

= 6440

Correct mean = X = 6440/ 40 = 161



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