CBSE Class 9 Mathematics Probability Set 05

Official CBSE Assignments for Class 9 Mathematics

Access comprehensive school assignments for Chapter 15 Probability using the CBSE Class 9 Mathematics Probability Set 05. Designed to align with the 2026-27 CBSE academic guidelines, these practice sets help Class 9 Mathematics students reinforce core concepts and improve their problem-solving accuracy.

Solved Practice Assignments for Mathematics

Access the complete assignment PDF for Class 9 Mathematics below. Regular practice with these targeted academic tasks builds familiarity with standard question patterns and helps secure higher marks in final school evaluations.

Question :  A teacher wanted to analyse the performance of two sections of students in a mathematics test of 100 marks. Looking at their performances, she found that a few students got under 20 marks and a few got 70 marks or above. So she decided to group them into intervals of varying sizes as follows: 0 − 20, 20 − 30… 60 − 70, 70 −100. Then she formed the following table:
D-8
(i) Find the probability that a student obtained less than 20 % in the mathematics test.
(ii) Find the probability that a student obtained marks 60 or above. 
Answer:
Totalnumber of students = 90
(i) Number of students getting less than 20 % marks in the test = 7
D-9
 
Question : To know the opinion of the students about the subject statistics, a survey of 200 students was conducted. The data is recorded in the following table.
 
D-10
Find the probability that a student chosen at random
(i)likes statistics, (ii) does not like it
Answer:
 
D-11
Question : The distance (in km) of 40 engineers from their residence to their place of work were found as follows.
5 3 10 20 25 11 13 7 12 31
19 10 12 17 18 11 32 17 16 2
7 9 7 8 3 5 12 15 18 3
12 14 2 9 6 15 15 7 6 12
What is the empirical probability that an engineer lives:
(i) less than 7 km from her place of work?
(ii) more than or equal to 7 km from her place of work?
(iii) within 1/2 km from her place of work?
Answer:  (i) Total number of engineers = 40
Number of engineers living less than 7 km from their place of work = 9
 
D-12
 
Question :  Eleven bags of wheat flour, each marked 5 kg, actually contained the following weights of flour (in kg):
4.97 5.05 5.08 5.03 5.00 5.06 5.08 4.98 5.04 5.07 5.00
Find the probability that any of these bags chosen at random contains more than 5 kg of flour.
Answer:
Number of total bags = 11
Number of bags containing more than 5 kg of flour = 7
Hence, required probability,  P = 7/11 
 
 
Question :  
D-13
The above frequency distribution table represents the concentration of sulphur dioxide in the air in parts per million of a certain city for 30 days. Using this table, find the probability of the concentration of sulphur dioxide in the interval 0.12 − 0.16 on any of these days.
Answer:  Number days for which the concentration of sulphur dioxide was in the interval of
0.12 − 0.16 = 2
Total number of days = 30
Hence, required probability, P =2/30 = 1/15
 
Question :  
Blood group   Number of students
A                           9
B                           6
AB                         3
O                          12
Total                      30
The above frequency distribution table represents the blood groups of 30 students of a class. Use this table to determine the probability that a student of this class, selected at random, has blood group AB.
Answer:
Number of students having blood group AB = 3
Total number of students = 30
Hence, required probability, P =3/30 = 1/10
 
 
 
 

Free study material for Mathematics

Download Practice Assignments: Class 9 Mathematics Chapter 15 Probability

Revision Assignment: Chapter 15 Probability (CBSE)

Access structured practice assignments for Chapter 15 Probability designed in alignment with the latest CBSE curriculum for Class 9 Mathematics. These printable sets cover objective and descriptive problem types to support thorough revision.

Key Advantages of Solving Chapter 15 Probability Assignments

  • Curriculum Standards: Assignments match modern CBSE sample formats to ensure relevant preparation.
  • Thorough Revision: Detailed problem sets reinforce core concepts and eliminate conceptual weak spots.
  • Execution Speed: Timed practice with assignment sets sharpens overall response timing.

How to Approach Mathematics Chapter 15 Probability Assignments

  1. Concept Foundation: Review the NCERT book for Class 9 Mathematics thoroughly before diving into assignment tasks.
  2. Self-Evaluation: Solve exercises independently before inspecting professional answer guides.
  3. Progress Monitoring: Note down complex formulas or concepts, clearing them up using available online practice aids.

FAQs

Where can I download the latest CBSE Class 9 Mathematics Chapter 15 Probability assignments?

You can download free PDF assignments for Class 9 Mathematics Chapter 15 Probability from StudiesToday.com. These practice sheets have been updated for the 2026-27 session covering all concepts from latest NCERT textbook.

Do these Mathematics Chapter 15 Probability assignments include solved questions?

Yes, our teachers have given solutions for all questions in the Class 9 Mathematics Chapter 15 Probability assignments. This will help you to understand step-by-step methodology to get full marks in school tests and exams.

Are the assignments for Class 9 Mathematics Chapter 15 Probability based on the 2026 exam pattern?

Yes. These assignments are designed as per the latest CBSE syllabus for 2026. We have included huge variety of question formats such as MCQs, Case-study based questions and important diagram-based problems found in Chapter 15 Probability.

How can practicing Chapter 15 Probability assignments help in Mathematics preparation?

Practicing topicw wise assignments will help Class 9 students understand every sub-topic of Chapter 15 Probability. Daily practice will improve speed, accuracy and answering competency-based questions.

Can I download Mathematics Chapter 15 Probability assignments for free on mobile?

Yes, all printable assignments for Class 9 Mathematics Chapter 15 Probability are available for free download in mobile-friendly PDF format.