The mean of 100 observations was calculated as 40 It was…

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The mean of 100 observations was calculated as 40. It was founder later on that one of the observation was misread as 83 instead of 53. The correct mean is :

  1. A. 39
  2. B. 39.7
  3. C. 40.3
  4. D. 42.7

Answer: Option B

Here is complete explanation of The mean of 100 observations was calculated as 40 It was….

Solution(By ExamCraze Team)

Difference = 53 - 83 = - 30
Change in average
= $$frac{- 30}{100}$$
= - 0.3
So, correct average
= 40 - 0.3
= 39.7

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