EduSahara™ Worksheet

Question 1

1.

A coin is tossed 70 times and tail appears 40 times. If the coin is tossed again, what is the probability of getting a head?

(i)

1
2
(ii)

4
7
(iii)

2
7
(iv)

3
7

Question 2

2.

A coin is tossed 100 times and head appears 20 times. If the coin is tossed again, what is the probability of getting a tail?

(i)

1
(ii)

5
6
(iii)

1
5
(iv)

3
5
(v)

4
5

Question 3

3.

Two coins are tossed simultaneously 60 times and it was observed that both heads appeared 20 times. If two coins are tossed simultaneously at random, what is the probability of getting both heads?

(i)

1
3
(ii)

0
(iii)

2
3
(iv)

1
2

Question 4

4.

Two coins are tossed simultaneously 130 times and it was observed that both tails appeared 120 times. If two coins are tossed simultaneously at random, what is the probability of getting both tails?

(i)

12
13
(ii)

1
(iii)

1
13
(iv)

11
13
(v)

13
14

Question 5

5.

A die is thrown 80 times. Prime numbers appeared on the upper face 50 times. If a die is thrown at random, what is the probability of getting a prime number?

(i)

1
2
(ii)

2
3
(iii)

3
4
(iv)

3
8
(v)

5
8

Question 6

6.

A survey of 50 men showed that only 35 of them know Sanskrit. Out of these men, if one is selected at random, what is the probability that the selected man knows Sanskrit?

(i)

3
5
(ii)

4
5
(iii)

8
11
(iv)

3
10
(v)

7
10

Question 7

7.

On a particular day, at a crossing in a city, the various types of 150 vehicles going past during a time-interval were observed as under:

Type of Vehicle

Three-wheeler

Two-wheeler

Four-wheeler

Frequency

45

50

55

Out of these vehicles, if one is choosen at random, what is the probability that the choosen vehicle is a 'Two-wheeler' ?

(i)

2
3
(ii)

1
3
(iii)

1
2
(iv)

0

Question 8

8.

The following table shows the blood-groups of 441 students of a class.

Blood group

A

O

B

AB

Number of students

63

99

135

144

One student of the class is choosen at random. What is the probability that the choosen student has blood group 'AB' ?

(i)

16
49
(ii)

33
49
(iii)

15
49
(iv)

17
49
(v)

17
50

Question 9

9.

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

(i)

5
6
(ii)

3
4
(iii)

4
5
(iv)

2
3
(v)

1
2

Question 10

10.

Two unbiased coins are tossed simultaneously. Find the probability of getting exactly one head.

(i)

3
4
(ii)

4
5
(iii)

1
2
(iv)

5
6
(v)

2
3

Question 11

11.

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

(i)

1
2
(ii)

1
(iii)

4
5
(iv)

1
4
(v)

3
4

Question 12

12.

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

(i)

1
4
(ii)

0
(iii)

1
2
(iv)

3
4
(v)

2
5

Question 13

13.

Two unbiased coins are tossed simultaneously. Find the probability of getting at most one head.

(i)

3
4
(ii)

1
(iii)

4
5
(iv)

1
4
(v)

1
2

Question 14

14.

Two unbiased coins are tossed simultaneously. Find the probability of getting no head.

(i)

1
4
(ii)

0
(iii)

2
5
(iv)

1
2
(v)

3
4

Question 15

15.

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

(i)

3
8
(ii)

5
8
(iii)

4
9
(iv)

1
4
(v)

1
2

Assignment Key