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?