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Get Answers to all your Questions
The mean of 100 observations was calculated as 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct mean is ?
Answers (1)
Given-
- Mean of 100 observations = 40
- So, the sum of all 100 observations = 100 × 40 = 4000
- One value was wrongly taken as 83 instead of 53 (it was 30 too high)
To find- Correct mean
Solution- Wrong total sum = 4000
Correct total sum = 4000 - 83 + 53 = 3970
Correct mean = Total correct sum ÷ Number of observations = 3970 ÷ 100 = 39.7
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