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example 4: An average of 75 bats per day (excluding Sunday) were sold in a particular
week. How many bats were sold in all in that week?

Solution: Average = Sum of number of bats sold ÷ Number of days

Number of days = 6 (excluding Sunday)

Average = 75 bats

So, sum of number of bats sold = Average × Number of days

So, 75 × 6 = 450
Thus, 450 bats were sold in all.

Think and Answer
Find the average height of your family members.

Practice time 2h

1. Find the average of the following:

(a) 16, 24, 35, 25, 20 (b) 120, 56, 108, 32

(c) 80 cm, 85 cm, 90 cm (d) 8 hours, 9 hours, 13 hours
2. What will be the average of:

(a) first six even numbers (b) first eight counting numbers

(c) first three two-digit numbers (d) first six composite numbers

3. A cricketer scores 60 runs, 44 runs, 8 runs, 95 runs, and 110 runs in 5
matches. Find his average score of 5.

4. The sum of 5 numbers is 3840. Find their average.
5. The income of a man in 7 consecutive days are 110, 70, 80, 95, 57,
120 and 140 respectively. Find his average income.
6. The average of a bowler is 4 wickets per match. If he plays 5 matches, find
the number of wickets taken by him.

7. The total marks obtained by Anamika in 5 subjects is 460. Find her average marks in
5 subject.
8. In a school, numbers of students present on Monday to Thursday are 725, 635, 735
and 625 respectively. If average given for five successive days is 700, find the number
of students present on Friday.

teacher’s
tip Explain to the children, how a divisor of one side changes into multiplier when it shifts to the other side.

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