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Q8. The average of a collection of 20 measurements was
calculated to be 56 cm. But later it was found that
a mistake had occurred in one of the measurements
which was recorded as 64 cm. But should have been 61 cm.
The correct average must be
a) 53 cm
b) 54.5 cm
c) 55.85 cm
d) 56.15 cm
Q9. The average of 8 numbers is 20. The average of first
two numbers is 151/2 and that of the next three is 211/3.
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
Q10. In a family of 8 adults and some minors,
the average consumption of rice per head per month is 10.8 kg,
while the average consumption for adults is 15 kg per head.
The number of minors in the family is:
a) 8
b) 6
c) 7
d) 9
Q11. The average daily wages of some workers of a factory is Rs 92.
There are 300 male and 200 female workers working in the factory.
Each female worker receives Rs 20 less than a male worker.
The daily wages of a male worker is
a) 80
b) Rs 96
c) Rs 100
d) Rs 120
Q12. There were 35 students in a hostel.
If the number of students is increased by 7 the expenditure on food
increases by Rs 42 per day while the average expenditure of students
is reduced by Rs 1. What was the initial expenditure on food per day?
a) Rs 400
b) Rs 432
c) Rs 442
d) 420
Q13. The average of 5 consecutive natural numbers is m.
If the next three natural numbers are also included,
how much more than m will the average of these 8 numbers be?
a) 2
b) 1
c) 1.4
d) 1.5
Q14. The average score of a class of boys and girls in an examination is A.
The ratio of boys and girls in the class is 3: 1. If the average score of
the boys is A+ 1, the average score of the girls is
a) A+1
b) A-1
c) A+3
d) A-3
Q15. The bowling average of a cricketer was 12.4. he improves
his bowling average by 0.2 points when he takes 5 wickets for
26 runs in his last match. The number of wickets taken by him
before the last match was
a) 125
b) 150
c) 175
d) 200
Q16. A cricketer has a certain average of runs for his 8 innings,
he scores 100 runs, thereby increases his average by 9 runs.
His new average of runs is
a) 20
b) 24
c) 28
d) 32
Answers
8 c 9 c 10 c 11 c 12 d 13 d 14 d 15 c 16 c
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