Out of 20 boys 6 are each of 1 m 15…

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Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The average height of all of them is :

  1. A. 1 m 12.1 cm
  2. B. 1 m 21.1 cm
  3. C. 1 m 21 cm
  4. D. 1 m 12 cm

Answer: Option A

Here is complete explanation of Out of 20 boys 6 are each of 1 m 15….

Solution(By ExamCraze Team)

According to the question,
Height of 6 persons
= 6 × 1 m 15 cm = 6 m 90 cm
Height of 8 persons
= 8 × 1 m 10 cm = 8 m 80 cm
Height of 6 persons
= 6 × 1 m 12 cm = 6 m 72 cm
Total Height of 20 persons
= 22 m 42 cm
Average = $$frac{{22{text{ m }}42{text{ cm}}}}{{20}}$$   = 1 m 12.1 cm

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