NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 14 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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:

The Lengths of 62 Leaves of a Plant Are Measured in Millimeters and the Data is Represented
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:

The Marks Obtained (Out of 100) by a Class of 80 Students
MarksNumber 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:

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.

The Distribution of Students of Sections a and B of a Class According to the Marks Obtained by Them
Section ASection B
MarksFrequencyMarksFrequency
53
1216
2825
3027
3540
1310

Represent the marks of the students of both the sections on the same graph by two frequency polygons. What do you observe?