Average

Average Worksheet-4

1. The average of 8 numbers is 20. The average of first two numbers is and that of the next three is . If the sixth number be less than the seventh and eighth numbers by 4 and 7 respectively, then the eighth number is:

(a) 18                  (b) 22                 (c) 25                  (d) 27

2. If the arithmetic mean of seventy–five numbers is calculated, it is 35. If each number is increased by 5, then mean of new numbers is:

(a) 30                 (b) 40                 (c) 70                  (d) 90

Average Worksheet-5

1. The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these two are excluded, the average age of the remaining players is one year less than the average age of the whole team. What is the average age of the team?

(a) 23 years       (b) 24 years       (c) 25 years       (d) None of these

2. The average height of 25 boys is 1.4 m. When 5 boys leave the group, then the average height increases by 0.15 m. What is the average height of the 5 boys who leave?

(a) 0.8 m           (b) 0.9 m           (c) 0.95 m         (d) 1.05 m

Average Worksheet-6

1. 10 years ago, the average age of a family of 4 members was 24 years. Two children having been born (with age difference of 2 years), the present average age of the family is the same. The present age of the youngest child is:

(a) 1 year            (b) 2 years         (c) 3 years         (d) 5 years

2. After replacing an old member by a new member, it was found that the average age of five members of a club is the same as it was 3 years ago. What is the difference between the ages of the replaced and the new member?

(a) 2 years         (b) 4 years         (c) 8 years         (d) 15 years