A library has an average number of 510 visitors on Sunday

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A library has an average number of 510 visitors on Sunday and 240 on other days. The average number of visitors per day in a month of 30 days beginning with Sunday is :

That month will have 5 sundays.

∴ Required average =	5 × 510 + 25 × 240
	40

Required average =	2550 + 6000
	30

Required average =	8550	= 285
	30

Second method to find the required average ,
Here,
n₁ = 5, a₁ = 510
n₂ = 25, a₂ = 240

∴ Average =	n₁a₁ + n₂a₂
	n₁ + n₂

Average =	5 × 510 + 25 × 240
	40

Average =	2550 + 6000
	30

Average =	8550	= 285
	30