Question

The mean of 10 observations was calculated as 40. It was detected on rechecking that the value of 45 was wrongly copied as 15. Find the correct mean.

Answer 1

Wrong mean = 40
No. of observations = 10
Total of 10 observations = 40 X 10 = 400
Correct Total = 400 - 15 + 45 = 430
Correct Mean = 430/10 = 43

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