1. The average marks of 12 students were calculated as 40. But it was later found that marks of one student have been entered wrongly as 42 instead of 54 and of another as 74 instead of 50. What is the correct average?
(a) 39 (b) 40 (c) 41 (d) None of these
2. The average temperature of the first three days of a week is 27 degree and of the next three days is 29 deg. If the weekly average is 28.5 deg, what is the temp on the last day?
(a) 31.5 deg (b) 42 deg (c) 44 deg (d) None of these
3. An investor in shares makes a profit of Rs.920 in his fifth investment, thereby
increasing his average profit of first four investments by Rs.14, his average profit over the first four investment is
(a) 906 (b) 976 (c) 850 (d) None of these
4. The average age of a class was 16 years. But 4 boys whose average age was 13 years and 6 months were admitted. The class average was 15 years and 7 months. How many boys were there after the new admission?
(a) 24 (b) 16 (c) 21 (d) 29
5. A motorist completes the journey between A and B at a constant speed of 20 Km per hour and covers the return journey from B to A at a constant speed of 30 Kmph.
What was the average speed?
(a) 50 Km/h (b) 28 Km/h (c) 26 Kmph (d)24 Kmph
6. Of the three numbers, the first is four times the second and three times the third.. If the average of all the three numbers is 95, then the third number is
(a) 57 (b) 76 (c) 38 (d) 60
7. The average of 5 consecutive numbers is ‘n’. If the next two numbers are also included the average will
(a) increase by 1 (b) remain the same (c) increase by 1.4 (d) increase by 2
8. The average weight of 5 men is decreased by 3 Kg when one of them weighing 150 Kg is replaced by another person. This new person is again replaced by another person whose weight is 30 Kg lower than the person he replaced. What is the overall change in the average due to this dual change?
(a) 6Kg (b) 9Kg (c) 12 Kg (d) 15 Kg
9. The average of a, b, c and d is 16. Half the sum of b, c and d is 28. The value of a is
(a) 8 (b) 10 (c) 12 (d) 16
10. The average weight of 20 balls is 2 gm. If the weight of the bag be included the average weight increases by 0.02gm. What is the weight of the bag?
(a) 2.04gm (b) 2.42 gms (c) 3.42 gms (d) 3.04gms
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