Question

A library has an average of 265 visitors on Sundays and 130 visitors on other days. The average number of visitors per day in a month of 30 days beginning with a Monday is:
1. 135
2. 165
3. 148
4. 129

Answer 1

Correct Answer - Option 3 : 148

Given:

A library has an average of 265 visitors on Sundays and 130 visitors on other days.

Formula used:

Average = (M₁ × N₁ + M₂ × N₂)/(M₁ + M₂)

Calculation:

Since the month begins with a Monday, so there will be four Sundays in the month.

M₁ = Number of Sunday

M₁ = 4

M₂ = Remaining days

M₂ = 26

N₁ = Average visitors on Sundays

N₁ = 265

N₂ = Average visitors on Sundays

N₂ = 130

Required average,     

⇒ (265 x 4 + 130 x 26)/30

⇒ 4440/30

⇒ 148

∴ The average number of visitors per day 148