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# NCERT Solution for Class 9 Mathematics Chapter 15 - Probability

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NCERT Textbook Solutions are considered extremely helpful when preparing for your CBSE Class 9 Mathematics exams. TopperLearning study resources infuse profound knowledge, and our Textbook Solutions compiled by our subject experts are no different. Here you will find all the answers to the NCERT textbook questions of Chapter 15 - Probability.

All our solutions for Chapter 15 - Probability are prepared considering the latest CBSE syllabus, and they are amended from time to time. Our free NCERT Textbook Solutions for CBSE Class 9 Mathematics will strengthen your fundamentals in this chapter and can help you to score more marks in the examination. Refer to our Textbook Solutions any time, while doing your homework or while preparing for the exam.

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Exercise/Page

## NCERT Solution for Class 9 Mathematics Chapter 15 - Probability Page/Excercise 15.1

Solution 1

Number of times batswoman hits a boundary = 6
Total number of balls played = 30 Number of times that the batswoman does not hit a boundary = 30 - 6 = 24 Solution 2

Total number of families = 475 + 814 + 211 = 1500   (i) Number of families having 2 girls = 475 (ii) Number of families having 1 girl = 814 (iii) Number of families having no girl = 211       Thus, the sum of all these probabilities is 1.  Thus, the sum of all these probabilities is 1.

Solution 3

Number of students born in August = 6
Total number of students = 40 = Solution 4

Number of times 2 heads come up = 72
Total number of times the coins were tossed = 200 Solution 5

Number of families surveyed = 2400   (i) Number of families earning Rs 10000 - 13000 per month and owning exactly 2 vehicles = 29
Required probability = (ii) Number of families earning Rs 16000 or more per month and owning exactly 1 vehicle = 579
Required probability = (iii) Number of families earning less than Rs 7000 per month and does not own any vehicle = 10       Required probability = (iv)  Number of families earning Rs 13000 - 16000 per month and owning     more than 2 vehicles = 25
Required probability = (v)  Number of families owning not more than 1 vehicle = 10 + 160 + 0 + 305 + 1 + 535 + 2 + 469 + 1       + 579 = 2062       Required probability = Solution 6

Total number of students = 90   (i)  Number of students who obtained less than 20% marks in the test = 7
Required probability = (ii)  Number of students who obtained marks 60 or above = 15 + 8 = 23
Required probability = Solution 7

Total number of students = 135 + 65 = 200   (i)  Number of students who like statistics = 135
P(student likes statistics) = (ii)  Number of students who do not like statistics = 65       P(student does not like statistics) = Solution 8

Total number of engineers = 40
(i)  Number of engineers living at a distance of less than 7 km form their place of work = 9
Required probability = (ii)  Number of engineers living at a distance of more than or equal to 7 km from their place of work        = 40 - 9 = 31
Required probability = (iii)  Number of engineers living within a distance of km from her place of work = 0
Required probability = 0

Solution 11

Total number of bags = 11
Number of bags containing more then 5 kg of flour = 7
Required probability = Solution 12

Number days for which the concentration of sulphur dioxide was in the interval of 0.12 - 0.16 = 2
Total number of days = 30
Required probability  = Solution 13

Number of students having blood group AB = 3
Total number of students = 30
Required probability = ## Browse Study Material

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TopperLearning provides step-by-step solutions for each question in each chapter in the NCERT textbook. Access Chapter 15 - Probability here for free.

Our NCERT Solutions for Class 9 Mathematics are by our subject matter experts. These NCERT Textbook Solutions will help you to revise the whole chapter, and you can increase your knowledge of Mathematics. If you would like to know more, please get in touch with our counsellor today!

# Text Book Solutions

CBSE IX - Mathematics

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