The average income of 40 persons is ₹ 4200 and that

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The average income of 40 persons is ₹ 4200 and that of another 35 persons is ₹ 4000. The average income of the whole group is :

Here, n₁ = 40, a₁ = ₹ 4200
n₂ = 35 , a₂ = ₹ 4000

∴ Average =	n₁a₁ + n₂a₂
	n₁ + n₂

Average income of whole group =	4200 × 40 + 4000 × 35
	75

Average income of whole group =	168000 + 140000
	75

Average income of whole group =	308000
	75

Average income of whole group = ₹ 4106	2
	3

₹ 4108	1
	3