A

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Q. 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 :

  • (A) 39
  • (B) 39.7
  • (C) 40.3
  • (D) 42.7
  • Correct Answer - Option(B)
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Explanation by: Admin

The mean of 100 observations = 40
It was found later on that one of the observations was misread as 83 instead of 53 ,
Difference = – 83 + 53 = – 30
∴ Decrease in average = – 30 ÷ 100 = – 0.3
∴ Required average = 40 – 0.3 = 39.7

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