1. A library has an average of 400 visitors on Sundays and 130 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:
Solution:
The month has 5 Sundays since it begins with a Sunday.
Average = [ 400(5) + 130(25)] / 30
= 5250/30
= 75.
2. If the average marks of these 3 batches of 40, 50 and 65 students respectively is 60, 65 and 70, then the average mark of all students is:
Solution:
Average = [40(60)+50(65)+65(70)]/ [40+50+65]
= [2400+3250+4550]/ 155
= 10200/155
= 65.8.
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