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CBSE - Class 9 Mathematics Probability Worksheet
A coin tossed 'n' times. The probability of getting head at least once if greater than 0.8, then the least value of such 'n' is
2
b.3
c.4
d.5
A bag contains 10 gold and 8 silver coins. Two successive drawings of 3 coins are made such that the first coin is replaced before the second drawing. Find the probability that the first drawing will give 3 gold and the second 3 silver coins.
0.10
b.0.12
c.0.01
d.0.02
If two dices are thrown together then find the probability of getting sum of numbers over two dices even ?
1/2
b.1/4
c.17/36
d.15/37
X can solve 80% of the problems while Y can solve 90% of the problems given in the books of statistics. If the problem selected at random, find the probability that at least one of them will solve the problem.
0.78
b.0.88
c.0.89
d.0.98
A bag contains 6 white, 4 red and 10 black balls. Two balls are drawn at random. Find the probability that they will both be black in colour
1/38
b.7/38
c.9/38
d.29/38
One bag contains 4 white and 2 black balls. Another contains 3 white and 5 black balls. If one ball is drawn from each bag, find the probability that both are white.
1/4
b.1/8
c.3/8
d.5/8
In a family there are 3 children. The probability that all of them will have different birthdays is
0.59
b.0.69
c.0.79
d.0.99
If two dice are thrown, what is the probability that the sum of numbers on the dice is greater than 8?
1/6
b.5/6
c.5/18
d.7/18
A box contains 400 bolts of which 20 are defective. Find the probability that a bolt chosen at random from the box is not defective.
38/40
b.19/20
c.9/20
d.Both (a) and (b)
Three coins are tossed what is the probability of getting at most one head?
1/2
b.1/4
c.1/8
d.3/8
Five men in a company of 20 are graduates. If 3 of them are picked out at random, then the probability that they all are graduates is
1/48
b.1/38
c.1/57
d.1/114
A person is known to hit a target in 5 out of 8 shots, where as another person is known to hit in 3 out of 5 shots. Find the probability that the target is hit at all when they both try.
11/20
b.17/20
c.15/20
d.7/20
An insurance company charges from a man of age 50 an annual premium of Rs. 15 on a policy of Rs. 1000. If the death rate is 6 per thousand per year of this age group, what is the expected gain for the insurance company?
Rs.9
b.Rs.6
c.Rs.8
d.Rs.5
The odds are 9:5 against a person who is 50 years living till he is 70 and 8:6 against a person who is 60 living till he is 80. Find the probability that at least one of them will be alive after 20 years.
3/7
b.5/14
c.15/49
d.31/49
Two dice are rolled simultaneously. Find the probability that at least 1 appears.
5/36
b.7/36
c.1/36
d.11/36
A box of 100 gaskets contains 10 gaskets with type A defects, 5 gaskets with type B defects and 2 gaskets with both types of defects. Find the probability that a gasket to be drawn has a type B defect under the condition that it has a type A defect?
1/6
b.1/5
c.1/4
d.1/2
If two dices are thrown together then find the probability of getting product of numbers over two dices even ?
1
b.1/2
c.3/4
d.4/3
A person applies for a job in two firms, say X and Y. The probability of his being selected in firm X is 0.7 and being rejected in firm Y is 0.5. The probability of at least one of his applications being rejected is 0.6. What is the probability that he will be selected in one of the two firms?
0.8
b.0.6
c.0.5
d.0.4
If a cake is chosen at random then find the probability that it has four candles?
3/8
b.1/2
c.1/8
d.5/8
A card is drawn at random from a well shuffled pack of 52 playing cards. Find the probability of getting neither a red card nor a queen.
6/13
b.7/13
c.8/13
d.23/52
Worksheet Answers
Solution:
18/36=1/2
