Present the following data in the form of a histogram :

Explanation

In the frequency distribution minimum class interval is 5. Other class interval are 10 and 20. Hence, before drawing the graph, frequency density should be calculated.It can be done by dividing frequencies by adjustment factor. The above table is adjusted as under :

In the above table, the class interval for the first four classes is 5.Fifth class , however, is of the interval of 10 (40-30=10) which is twice as much as the class interval of the first four classes. Accordingly, frequency of the fifth class is divided by 2. Further, class interval of the 6th class is 20 (60-40=20) which is 4 times the minimum class interval of 5.Accordingly, frequency of this class is divided by 4.Likewise , the frequencies of other classes have been adjusted . It is based on this table that the histogram is drawn , as given below :