The average of 9 observations was found to be 35 Later…

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The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. The correct average of the observation is –

  1. A. 28
  2. B. 42
  3. C. 32
  4. D. 45

Answer: Option B

Here is complete explanation of The average of 9 observations was found to be 35 Later….

Solution(By ExamCraze Team)

Difference = 81 - 18 = 63
So, change in average = $$frac{+ 63}{9}$$ = + 7
Correct average = 35 + 7 = 42

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