Chapter 15 – Probability

The marks obtained by 17 students in a mathematics test (out of 100) are given below : The marks obtained by 17 students in a mathematics test (out of 100) are given below : July 4, 2021 Category: Chapter 14 - Statistics , Chapter 15 - Probability , Maths , NCERT Class 9 ,

12. A total of 25 patients admitted to a hospital are tested for levels of blood sugar, (mg/dl) and the results obtained were as follows : Find mean, median and mode (mg/dl) of the above data (mg/dl) and the results obtained were as follows : Find mean 12. A total of 25 patients admitted to [...]

11. The mean marks (out of 100) of boys and girls in an examination are 70 and 73, respectively. If the mean marks of all the students in that examination is 71, find the ratio of the number of boys to the number of girls. 11. The mean marks (out of 100) of boys and [...]

10. The mean of the following distribution is 50. Find the value of a and hence the frequencies of 30 and 70. 10. The mean of the following distribution is 50. Find the value of a and hence the frequencies of 30 and 70. July 4, 2021 Category: Chapter 14 - Statistics , Chapter 15 [...]

9. Following table gives the distribution of students of sections A and B of a class according to the marks obtained by them. Represent the marks of the students of both the sections on the same graph by two frequency polygons. What do you observe? 1. The class mark of the class 90 - 120 [...]

8. Refer to Q. 7 : Draw the frequency polygon representing the above data without drawing the histogram. 8. Refer to Q. 7 : Draw the frequency polygon representing the above data without drawing the histogram. July 4, 2021 Category: Chapter 14 - Statistics , Chapter 15 - Probability , Maths , NCERT Class 9 [...]

7. Following table shows a frequency distribution for the speed of cars passing through at a particular spot on a high way : Draw a histogram and frequency polygon representing the data above. 7. Following table shows a frequency distribution for the speed of cars passing through at a particular spot on a high way [...]

6. The marks obtained (out of 100) by a class of 80 students are given below : Construct a histogram to represent the data above. 6. The marks obtained (out of 100) by a class of 80 students are given below : Construct a histogram to represent the data above. July 4, 2021 Category: Chapter [...]

5. The lengths of 62 leaves of a plant are measured in millimetres and the data is represented in the following table : Draw a histogram to represent the data above. 5. The lengths of 62 leaves of a plant are measured in millimetres and the data is represented in the following table : Draw [...]

4. Draw a histogram to represent the following grouped frequency distribution : 4. Draw a histogram to represent the following grouped frequency distribution : July 4, 2021 Category: Chapter 14 - Statistics , Chapter 15 - Probability , Maths , NCERT Class 9 ,