The mean of 40 observation was 160.It was detected on re checking that the value of 165 was wrongly copied as 125 for computation of mean. Find the mean
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Answer:Incorrect Mean =X’ = 160
No of observations = 40
Incorrect Sum of observations = sum x ’= 160 x 40 = 6400
Correct sum of observations = = sum x’ – 125 +165
= 6400 +40
= 6440
Correct mean = X = 6440/ 40 = 161
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