Question

Draw histograms for the following frequency distributions:

Class Interval	30-39	40-49	50-59	60-69	70-79
Frequency	24	16	09	15	20

Answer 1

Class Interval (Inclusive form)	Class Interval (Exclusive Form)	Frequency
30-39	29.5-39.5	24
40-49	39.5-49.5	16
50-59	49.5-59.5	09
60-69	59.5-69.5	15
70-79	69.5-79.5	20

Steps of construction:

(a) Convert the data into the exclusive form. [Here, adjustment factor $=0.5$]

(b) Taking suitable scales, mark the class intervals on the x-axis and the frequency on the y-axis.

(c) Construct rectangles with class intervals as bases and corresponding frequencies as heights.