The average of a collection of 20 measurements was calculated to…

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The average of a collection of 20 measurements was calculated to tb 56 cm. But later it was found that a mistake had occurred in one of the measurement which was recorded as 64 cm., but should have been 61 cm. The correct average must be –

  1. A. 53 cm
  2. B. 54.5 cm
  3. C. 55.85 cm
  4. D. 56.15 cm

Answer: Option C

Here is complete explanation of The average of a collection of 20 measurements was calculated to….

Solution(By ExamCraze Team)

According to the question,
Correct average
= $$frac{20 × 56 - 64 + 61}{20}$$  
= $$frac{1120 - 3}{20}$$  
= $$frac{1117}{20}$$  
= 55.85 cm

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