Introduction : Average

SAMPLE PROBLEMS

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. In Arun’s opinion, his weight is greater than 65 kg but less than 72 kg. His brother doest not agree with Arun and he thinks that Arun’s weight is greater than 60 kg but less than 70 kg. His mother’s view is that his weight cannot be greater than 68 kg. If all are them are correct in their estimation, what is the average of different probable weights of Arun?

a. 67 kg
b. 68 kg
c. 69 kg
d. Data inadequate
e. None of these

3. 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:

a. 250
b. 276
c. 280
d. 285

4. The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is:

a. 17 kg
b. 20 kg
c. 26 kg
d. 31 kg

Answers—  1.A   2.A   3.D    4.D