Mean of 10 numbers is 30 Later on it was observed…

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Mean of 10 numbers is 30. Later on it was observed that numbers 15, 23 are wrongly taken as 51, 32. The correct mean is :

  1. A. 25.5
  2. B. 32
  3. C. 30
  4. D. 34.5

Answer: Option A

Here is complete explanation of Mean of 10 numbers is 30 Later on it was observed….

Solution(By ExamCraze Team)

According to the question,
Mean of 10 numbers is = 30
∴ Sum of 10 numbers is = 300
It was observed that numbers 15, 23 are wrongly taken as 51, 32
Difference
= (51 + 32) - (15 + 23)
= 83 - 38
= 45 (more)
∴ Actual sum of 10 numbers
= 300 - 45 = 255
∴ Actual average of 10 numbers
= $$frac{255}{10}$$ = 25.5

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