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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 |
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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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