Question

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:
1. 300
2. 290
3. 285
4. None of these

Answer 1

Correct Answer - Option 3 : 285

Given:

Visitors on Sunday = 510

Visitors on other days = 240

Number of days in a month = 30 days

Formula Used:

Average = Sum of the observation/Number of observation

Calculation:

If a month starts with Sunday 

then the number of Sundays = 5

Total number of other days in month = 30 - 5 = 25 days

Average visitors on 5 sunday = 510 × 5 = 2550

Average visitors on 25 other days = 25 × 240 = 6000

Total number of visitors in a month of 30 days = 2550 + 6000 = 8550

Average visitors per day in a month = 8550/30 ⇒ 285

∴ The average number of visitors per day in a month of 30 days beginning with Sunday is 285