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:

• A. 135
• B. 165
• C. 148
• D. 129

Answer 1

Answer:

C. 148

Solution:

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 remaining days

N₂ = 130

Required average,     

⇒$\frac{(265\times{4} + 130\times{26})}{30}$

⇒ $\frac{4440}{30}$

⇒ 148

∴ The average number of visitors per day 148