EduSahara™ Worksheet

Question 1

1.

91 cards are numbered 1,2,3,....91 and put in a box and mixed thoroughly. A card is drawn at random. What is the probability that the number on the drawn card is an odd number?

(i)

47
91
(ii)

45
91
(iii)

47
92
(iv)

46
91

Question 2

2.

A coin is tossed 80 times and tail appears 65 times. If the coin is tossed again, what is the probability of getting a head?

(i)

3
16
(ii)

1
8
(iii)

13
16
(iv)

1
4
(v)

4
17

Question 3

3.

An unbiased die is thrown once. Find the probability of getting an even number?

(i)

2
3
(ii)

1
2
(iii)

3
4
(iv)

5
6
(v)

4
5

Question 4

4.

A survey of 80 men showed that only 55 of them know Hindi. Out of these men, if one is selected at random, what is the probability that the selected man knows Hindi?

(i)

5
8
(ii)

5
16
(iii)

12
17
(iv)

11
16
(v)

3
4

Question 5

5.

Two unbiased coins are tossed simultaneously. Find the probability of getting at least two heads.

(i)

2
5
(ii)

1
2
(iii)

0
(iv)

3
4
(v)

1
4

Question 6

6.

There are 66 students in a class room of whom 28 are boys and 38 are girls. From these students, one is choosen at random. What is the probability that the choosen student is a girl ?

(i)

20
33
(ii)

19
33
(iii)

6
11
(iv)

14
33
(v)

10
17

Question 7

7.

A bag contains 32 black marbles, 24 gray marbles, 56 white marbles and 40 pink marbles. One marble is drawn at random from the bag. Find the probability that the marble drawn is neither pink nor gray.

(i)

10
19
(ii)

3
5
(iii)

8
19
(iv)

11
19
(v)

12
19

Question 8

8.

A box contains 80 discs which are numbered from 1 to 80. If one disc is drawn at random from the box, find the probability that it bears a two-digit number.

(i)

71
80
(ii)

7
8
(iii)

9
80
(iv)

8
9
(v)

9
10

Question 9

9.

A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears a perfect square number.

(i)

2
11
(ii)

1
5
(iii)

0
(iv)

1
10
(v)

9
10

Question 10

10.

A die is thrown twice. What is the probability that 1 will come up atleast once?

(i)

5
18
(ii)

1
3
(iii)

25
36
(iv)

11
36
(v)

12
37

Question 11

11.

Which of the following are possible values of probability?

a)

4

b)

-4.1

c)

9

5

d)

2

9

e)

0.12

(i)

{d,e}
(ii)

{c,a,d}
(iii)

{a,d}
(iv)

{b,e}
(v)

{b,e,d}

Question 12

12.

A carton consist of 60 shirts of which 50 are good, 7 have minor defects and 3 have major defects. Hari, a trader, will only accept the shirts which are good, but Deepti, another trader, will only reject the shirts which have major defects. One shirt is drawn at random from the carton. What is the probability that it is acceptable to Deepti?

(i)

1
20
(ii)

1
(iii)

9
10
(iv)

19
20
(v)

20
21

Question 13

13.

An unbiased die is thrown once. Find the probability of getting a number less than 2?

(i)

2
7
(ii)

5
6
(iii)

1
6
(iv)

0
(v)

1
3

Question 14

14.

A box contains 56 orange marbles, 60 pink marbles, 56 blue marbles and 16 gray marbles. One marble is drawn at random from the box. Find the probability that the marble drawn is orange.

(i)

5
16
(ii)

13
47
(iii)

15
47
(iv)

14
47
(v)

33
47

Question 15

15.

A single unbiased coin is tossed. Find the probability of getting a head.

(i)

2
3
(ii)

1
2
(iii)

3
4
(iv)

5
6
(v)

4
5

Question 16

16.

Two unbiased dice are thrown simultaneously. Find the probability of getting 6 as the sum of the two numbers on the dice.

(i)

6
37
(ii)

1
6
(iii)

31
36
(iv)

1
9
(v)

5
36

Question 17

17.

A die is thrown twice. What is the probability that 6 will not come up either time?

(i)

2
3
(ii)

25
36
(iii)

13
18
(iv)

26
37
(v)

11
36

Question 18

18.

Three unbiased coins are tossed simultaneously. Find the probability of getting at least one head.

(i)

8
9
(ii)

3
4
(iii)

7
8
(iv)

1
8
(v)

1

Question 19

19.

When a card is selected randomly out of a pack of cards, how many elementary events are possible?

(i)

53
(ii)

51
(iii)

52
(iv)

49
(v)

55

Question 20

20.

An unbiased die is thrown once. Find the probability of getting a number greater than 2?

(i)

1
3
(ii)

3
4
(iii)

1
(iv)

2
3

Question 21

21.

80 cards are numbered 1,2,3,....80 and put in a box and mixed thoroughly. A card is drawn at random. What is the probability that the number on the drawn card is a prime number?

(i)

29
40
(ii)

12
41
(iii)

1
4
(iv)

11
40
(v)

3
10

Question 22

22.

One card is drawn at random from a well shuffled deck of 52 cards. What is the probability that the card drawn is a face card ?

(i)

1
52
(ii)

1
4
(iii)

1
13
(iv)

1
26
(v)

3
13

Question 23

23.

A die is thrown 100 times. Prime numbers appeared on the upper face 80 times. If a die is thrown at random, what is the probability of getting a prime number?

(i)

1
5
(ii)

3
5
(iii)

4
5
(iv)

1
(v)

5
6

Question 24

24.

Three unbiased coins are tossed simultaneously. Find the probability of getting at least two heads.

(i)

4
5
(ii)

5
6
(iii)

3
4
(iv)

1
2
(v)

2
3

Question 25

25.

One card is drawn at random from a well shuffled deck of 52 cards. What is the probability that the card drawn is a hearts?

(i)

1
13
(ii)

1
4
(iii)

1
52
(iv)

1
26
(v)

3
13

Assignment Key