Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of

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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

We can find the required average height with the help of given formula ,
Here, n₁ = 6 , a₁ = 1.15 m ,
n₂ = 8 , a₂ = 1.10 m , n₂ = 6 , a₂ = 1.12 m

∴ Average height =	n₁a₁ + n₂a₂ + n₃a₃
	n₁ + n₂ + n₃

Average height =	6 × 1.15 + 8 × 1.1 + 6 × 1.12
	20

Average height =	6.9 + 8.8 + 6.72
	20

Average height =	22.42
	20

Average height = 1 meter 12.1 m