Question

Draw a frequency polygon of the following frequency distribution table.

Class	0 – 10	10 – 20	20 – 30	30 – 40	40 – 50	50 – 60	60 – 70	70 – 80	80 – 90	90 – 100
Frequency	8	10	6	7	9	8	8	6	3	4

Answer 1

Given frequency distribution is grouped and continuous. So we construct a histogram by using earlier method. Join the middle points of P,Q,R,S,T,U,V, W,X, Y of upper horizontal lines of each rectangle A,B,C,D,E,F,G,H,I,J by straight line in successions.