Q11. The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest numbers ?
A. 2
B. 5
C. 6
D. 8
Q12. In Arun’s opinion, his weight is greater than 65 kg but less than 72 kg. His brother does not agree with Arun and he thinks that Arum’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 of them are correct in their estimation, what is the average of different probable weights of Arun ?
A. 67 kg
B. 68 kg
C. 66.5 kg
D. 69 kg
Q13. The average of 7 consecutive numbers is 20. The largest of these numbers is :
A. 20
B. 23
C. 22
D. 24
Q14. The average of 7 consecutive numbers is 20. The largest of these numbers is :
A. 4.6
B. 4.7
C. 4.8
D. 4.5
Q15. The average score of a cricketer for ten matches is 38.9 runs. If the average for the first six matches is 42, then find the average for the last four matches.
A. 34.25
B. 35
C. 33.25
D. 33.5
Q16. If the mean of 5 observations x, x + 2, x + 4, x + 6 and x+ 8 is 11, then the mean of the last three observations is :
A. 15
B. 17
C. 11
D. 13
Q17. If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55 and 60, then the average marks of all the students is :
A. 55
B. 58
C. 53.33
D. 54.68
Q18. A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the mean to be 12. What should be the number in place of x ?
A. 3
B. 7
C. 17
D. 31
Q19. A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family ?
A. 222/7 years
B. 242/7 years
C. 225/7 years
D. 200/7 years
Q20. The average weight of 16 boys in a class is 50.25 kgs and that of the remaining 8 boys is 45.15 kgs. Find the average weight of all the boys in the class.
A. 47.55 kgs
B. 48.55 kgs
C. 49.25 kgs
D. 48 kgs
