Draw a histogram for the following frequency distribution.

Answer: Histogram with rectangles of heights 150, 400, 460, 540, 600, 350 on the classes 50–70, ..., 150–170

Steps: Take use of electricity (unit) on the X-axis and number of families on the Y-axis, with a convenient scale on each. Since the first class does not start at 0, show a kink mark between the origin and the first class. On each class interval draw a rectangle whose height equals its frequency; adjacent rectangles touch each other (no gaps). The tallest rectangle is for the class 130–150 (frequency 600).