A library has an average of 510 visitors on Sundays and 240 on other days

• Averages

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

1. 250
2. 276
3. 280
4. 285

Answer

Since the month begins with a Sunday, there will be a total of 5 Sundays in the month.

Weighted Average = {(510 x 5) + (240 x 25)}/30 = 285

The correct option is D.