2. When three coins are tossed simultaneously, find the probability of getting at least two Tails

3. Three coins are tossed simultaneously 200 times with the following frequencies of different Outcomes

Out comes 3 Heads 2 Heads 1 Head No head

Frequency 23 72 77 28

Find the probability of getting: a) 2 Heads b) at least 2 Heads

4. A dice is thrown once, find the probability of getting a prime number (1/2)

5. A Pair of dice is thrown once, find the probability of getting a doublet (1/6)

6. A dice is thrown once. Find the probability of getting:

a) An even number (1/2)

b) A prime number (1/2)

c) A number greater than 4 (1/3)

7. A fair die is tossed once. Find the probability of getting:

a) a number more than or equal to 3 ( 2/3)

b) a multiple of 3 (1/3)

8. A letter of English alphabet is choosen at random. Calculate the probability that the letter choosen is a vowel ( 5/26)

9. A bag contains 15 balls numbered 1 to 15. Find the probability of drawing a prime number, When one ball is drawn from the bag at random (2/5)

10. Marks obtained by 50 students in a class test of 100 marks are given below

Marks 0 - 25 25 - 50 50 – 75 75 - 100

No of students 4 12 18 16

Find the probability that a student obtained less than 50% marks

11. in a one day international cricket match, a batsman played 40 balls. The runs scored as Follows

Runs scored 0 1 2 3 4 6

No of balls 13 15 5 1 4 2

Find the probability that the batsmen will score:

a) 6 runs ( 1/20)

b) A four or a six run (3/20)

12. One number is chosen at random from numbers 1 to 100. Find the probability that it is Divisible by 4 or 6 (33/100)

13. In a survey of 80 people, 60 people like apple juice and remaining dislike it. Find the

Probability that people dislike apple juice (1/4)

14. 250 families with 2 children are selected randomly and following data were obtained

Number of sons in family 2 1 0

Number of families 75 125 50

Find the probability of families having

a) 2 sons b) 1 son c) no son

15. 1500 family with 2children were selected randomly and the following data was recorded

Number of girls in family 2 1 o

Number of family 475 814 211

Compute probability of a family chosen at random having

a) At most 1 girl (41/60)

b) At least 2 girls (19/60)

16. Probability of an impossible event is always………

a) 0 b) 1 c) 2 d) ½

17. A die is thrown once. The probability of getting an even prime number is

a) ½ b) 1/3 c) 1/6 d) 2/3

18. A coin is tossed once then probability of getting head is

a) 2 b) 1 c) ½ d) 3

19. There are 10 bulbs in a bag in which 4 bulbs are good and rest are fused, then the

Probability of fused bulbs is

a)3/5 b) 2/5 c) 1 d) 2/3

20. Sum of the probability of happening and not happening of an event is

a) 1 b) 2 c) 0 d) none of these

21. The probability of winning a game is 0.3. Then, the probability of losing a game is

a) 0.3 b) 0.7 c) 0.6 d) 0.1

22. The Probability of a sure event is

a) 1 b) – 1 c) 0 d) none of these

23. Out of 35 students participating in a debate 10 are girls. The probability that winner is a boy is :

a) 1/7 b) 3/7 c)4/7 d) 5/7

24. Which of the following cannot be the probability of an event

a) 1/5 b) 0.3 c) 4% d) 5/4

25. In a cricket match, a batsman hits a sixer 8 times out of32 balls played. The probability that a sixer is not hit in a ball is :

a)0.75 b) 0.25 c) – 0.25 d) 0.5

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