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:

The Lengths of 62 Leaves of a Plant Are Measured in Millimeters and the Data is Represented
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
The marks obtained (out of 100) by a class of 80 students

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:

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
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?

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