Here we provide NCERT Solutions for Class 9 Maths Chapter 15 – Probability for English medium students, Which will very helpful for every student in their exams. Students can download the latest NCERT Class 9 Maths solution Chapter 15 pdf. Now you will get step by step solution to each question.**Answer**

Total numbers of students = 135 + 65 = 200

(i) Numbers of students who like statistics = 135

Required probability = 135/200 = 27/40

(ii) Numbers of students who does not like statistics = 65

Required probability = 65/200 = 13/40

8. Refer to Q.2, Exercise 14.2. 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**

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 3 2 17 16 2 7 9 7 8 3 5 12 15 18 3 12 14 2 9 6 15 15 7 6 12

Total numbers of engineers = 40

(i) Numbers of engineers living less than 7 km from her place of work = 9

Required probability = 9/40

(ii) Numbers of engineers living less than 7 km from her place of work = 40 – 9 = 31

Required probability = 31/40

(iii) Numbers of engineers living less than 7 km from her place of work = 0

Required probability = 0/40 = 0

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11. 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**

Total numbers of bags = 11

Numbers of bags containing more than 5 kg of flour = 7

Required probability = 7/11

12. In Q.5, Exercise 14.2, you were asked to prepare a frequency distribution table, regarding 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.

The data obtained for 30 days is as follows:

0.03 0.08 0.08 0.09 0.04 0.17 0.16 0.05 0.02 0.06 0.18 0.20 0.11 0.08 0.12 0.13 0.22 0.07 0.08 0.01 0.10 0.06 0.09 0.18 0.11 0.07 0.05 0.07 0.01 0.04

**Answer**

Total numbers of days data recorded = 30 days

Numbers of days in which sulphur dioxide in the interval 0.12-0.16 = 2

Required probability = 2/30 = 1/15

13. In Q.1, Exercise 14.2, you were asked to prepare a frequency distribution table regarding 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.

The blood groups of 30 students of Class VIII are recorded as follows:

A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O, A, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O.

**Answer**

Total numbers of students = 30

Numbers of students having blood group AB = 3

Required probability = 3/30 = 1/10

**All Chapter NCERT Solutions For Class 9 Maths**

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