71). The average age of two boys and their father is greater than the average age of those two boys and their mother by 3 yr. The average age of the four is 19 yr, If the average age of the two boys be 5-1/2 yr, then find the age of the father and mother.
| A). 37 yr and 28 yr |
| B). 47 yr and 38 yr |
| C). 50 yr and 41 yr |
| D). 35 yr and 32 yr |
|
72). Find the average of the following set of scores. 124, 856, 331, 227, 963, 338, 259 and 662.
| A). 570 |
| B). 660 |
| C). 141 |
| D). 470 |
|
73). Average age of 5 boys is 16 yr. of which that of 4 boys is 16 yr 3 months. The age of the 5th boy is
| A). 15 yr |
| B). 15 yr 6 months |
| C). 15 yr 4 months |
| D). 15 yr 2 months |
|
74). A businessman purchased 30 TV sets in Rs.300000. If the average cost of 15 TV sets is Rs.9000, then find out the average cost of remaining TV sets.
| A). Rs.20000 |
| B). Rs.12000 |
| C). Rs.11000 |
| D). Rs.10000 |
|
75). The average of four consecutive numbers A, B, C, and D is 49.5. What is the product of B and D?
| A). 2499 |
| B). 2352 |
| C). 2450 |
| D). 2550 |
|
76). The average height of the basketball team A is 5 ft. 11 inches and that of B is 6 ft. 2 inches. There are 20 players in team A and 18 players in team B. The overall average height is
| A). 72.42 inches |
| B). 71.00 inches |
| C). 70.22 inches |
| D). 70.00 inches |
|
77). The average of 13 results is 60. If the average of first 7 results is 59 and that of last 7 result is 61, what will be the seventh result?
| A). 90 |
| B). 50 |
| C). 75 |
| D). 60 |
|
78). The average of nine numbers is 50. The average of the first five numbers is 54 and that of the last three numbers is 52. Then, the sixth number is
| A). 34 |
| B). 24 |
| C). 44 |
| D). 30 |
|
79). The mean marks obtained by seven students in a group is 226. If the marks obtained by six of them are 340, 180, 260, 56, 275 and 307 respectively, find the marks obtained by the seventh student.
| A). 164 |
| B). 226 |
| C). 340 |
| D). Cannot be determined |
|
80). A cricketer has a mean score of 60 runs in 10 innings. Find out how many runs are to be scored in the eleventh innings to raise the mean score to 62?
| A). 80 |
| B). 81 |
| C). 83 |
| D). 82 |
|
