the mean of 40 observations was 160. it was detected on rechecking that the value of 165 was wrongly copied as 125 for computation of mean. find the correct mean.
Answers
Answered by
19
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 +16= 6400 +40
= 6440
Correct mean = X = 6440/ 40 = 161
Similar questions