NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 14
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Q.5. The lengths of 62 leaves of a plant are measured in millimeters and the data is represented in the following table:
Length (in mm) | Number of leaves |
| 8 |
| 10 |
| 12 |
| 17 |
| 7 |
| 5 |
| 3 |
Draw a histogram to represent the data above.
Q.6. The marks obtained (out of 100) by a class of 80 students are given below:
Marks | Number of students |
| 6 |
| 17 |
| 15 |
| 16 |
| 26 |
Construct a histogram to represent the data above.
Q.7. Following table shows a frequency distribution for the speed of cars passing through at a particular spot on a high way:
Class interval (km/h) | Frequency |
| 3 |
| 6 |
| 25 |
| 65 |
| 50 |
| 28 |
| 14 |
Draw a histogram and frequency polygon representing the data above.
Q.8. Refer to Q. 7 : Draw the frequency polygon representing the above data without drawing the histogram.
Q.9. Following table gives the distribution of students of sections A and B of a class according to the marks obtained by them.
Section A | Section B | ||
Marks | Frequency | Marks | Frequency |
| 5 |
| 3 |
| 12 |
| 16 |
| 28 |
| 25 |
| 30 |
| 27 |
| 35 |
| 40 |
| 13 |
| 10 |
Represent the marks of the students of both the sections on the same graph by two frequency polygons. What do you observe?