RD SHARMA Solutions for Class 9 Maths Chapter 25 - Probability
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Chapter 25 - Probability Exercise 25.16
Question 1
The probability of an impossible event is
(a) 1
(b) 0
(c) less than 0
(d) greater than 1
Solution 1
The probability of an impossible event is always zero since the chances of occurring of that event is zero.
Hence, correct option is (b).
Question 2
The probability of a certain event is
(a) 0
(b) 1
(c) greater than 1
(d) less than 0
Solution 2
Question 3
The probability an event of a trial is
(a) 1
(b) 0
(c) less than 1
(d) more than 1
Solution 3
Question 4
Solution 4
Question 5
Solution 5
Chapter 25 - Probability Exercise 25.17
Question 1
A coin is tossed 1000 times, if the probability of getting a tail is 3/8, how many times head is obtained?
(a) 525
(b) 375
(c) 625
(d) 725
Solution 1
Question 2
A dice is rolled 600 times and the occurrence of the outcomes 1, 2, 3, 4, 5 and 6 are given below:
| Outcome | 1 | 2 | 3 | 4 | 5 | 6 |
| frequency | 200 | 30 | 120 | 100 | 50 | 100 |
The probability of getting a prime number is
Solution 2
Question 3
The percentage of attendance of different classes in a year in a school is given below:
| Class: | X | IX | VIII | VII | VI | V |
| Attendance: | 30 | 62 | 85 | 92 | 76 | 55 |
What is the probability that the class attendance is more than 75%?
Solution 3
Question 4
A bag contains 50 coins and each coin is marked from 51 to 100. One coin is picked at random. The probability that the number on the coin is not a prime number, is
Solution 4
Question 5
In a football match, Ronaldo makes 4 goals from 10 penalty kicks. The probability of converting a penalty kick into a goal by Ronaldo, is
Solution 5
Chapter 25 - Probability Exercise Ex. 25.1
Question 1
A coin is tossed 1000 times with the following frequencies:
Head : 455, Tail : 545
Compute the probability for each event.
Head : 455, Tail : 545
Compute the probability for each event.
Solution 1
Question 2
Two coins are tossed simultaneously 500 times with the following frequencies of different outcomes:
Two heads : 95 times
One tail : 290 times
No head : 115 times
Find the probability of occurrence of each of these events.
Solution 2
Question 3
Solution 3
Question 4
1500 families with 2 children were selected randomly and the following data were recorded:
If a family is chosen at random, compute the probability that it has:
(i) No girl
(ii) 1 girl
(iii) 2 girls
(iv) at most one girl
(v) more girls than boys
| Number of girls in a family: | 0 | 1 | 2 |
| Number of families: | 211 | 814 | 475 |
If a family is chosen at random, compute the probability that it has:
(i) No girl
(ii) 1 girl
(iii) 2 girls
(iv) at most one girl
(v) more girls than boys
Solution 4
Question 5
In a cricket match, a batsman hits a boundary 6 times out of 30 balls he plays.
Find the probability that on a ball played:
(i) he hits boundary
(ii) he does not hit a boundary.
Find the probability that on a ball played:
(i) he hits boundary
(ii) he does not hit a boundary.
Solution 5
Question 6
The percentage of marks obtained by a student in monthly unit tests are given below:
Find the probability that the student gets:
(i) More than 70% marks
(ii) less than 70% marks
(iii) a distinction.
| Units Test: | I | II | III | IV | V |
| Percentage of marks obtained: | 69 | 71 | 73 | 68 | 76 |
Find the probability that the student gets:
(i) More than 70% marks
(ii) less than 70% marks
(iii) a distinction.
Solution 6
Question 7
Solution 7
Question 8
Solution 8
Question 9
Solution 9
Question 10
|
Following table shows the birth month of 40 students of class IX. |
|||||||||||
|
Jan |
Feb |
March |
April |
May |
June |
July |
Aug. |
Sept. |
Oct. |
Nov. |
Dec. |
|
3 |
4 |
2 |
2 |
5 |
1 |
2 |
5 |
3 |
4 |
4 |
4 |
|
Find the probability that a student was born in August. |
|||||||||||
Solution 10
Question 11
Solution 11
Question 12
Solution 12
Question 13
Solution 13
Question 14
Solution 14
CBSE Class 9 Maths Homework Help
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