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. F

Question

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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Ella 4 days 2021-09-14T18:02:52+00:00 1 Answer 0 views 0

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    2021-09-14T18:04:10+00:00

    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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