For the following frequency distribution and taking suitable scales on both the axes, draw a histogram.

Class-interval	Frequency
45-60	8
60-75	6
75-90	16
90-105	22
105-120	12
120-135	4

Use the graph drawn to estimate the value of the mode.

Steps :

1. Draw a histogram of the given distribution.

2. In side the highest rectangle, which represent the maximum frequency (or modal class), draw two lines TU and VW diagonally from the upper corners T and V of adjacent rectangles.

3. Through the point Z (the point of intersection of diagonals), draw QZ perpendicular to horizontal axis.

4. The value of point Q on the horizontal axis represents the value of mode.

∴ Mode = 96

Hence, mode = 96.