Question

Show the following data by a frequency polygon.

Electricity bill (Rs)	0 - 200	200 - 400	400 - 600	600 - 800	800 - 1000
Families	240	300	450	350	160

Answer 1

Consider the following table

Class (Electricity bill in Rupees)	Class Mark	Frequency (Number of families)
0 - 200	100	240
200 - 400	300	300
400 - 600	500	450
600 - 800	700	350
800 - 1000	900	160

The frequency polygon using the class mark and frequancy given in the above table as