# NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 14

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?

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