Question

Draw a frequency polygon of the following data using histogram.

Class interval	$0-10$	$10-20$	$20-30$	$30-40$	$40-50$	$50-60$
Frequency	$5$	$10$	$25$	$16$	$12$	$8$

Answer 1

Mark the class intervals along the X-axis and the frequencies along the Y-axis with appropraite scale shown in the Figure. Draw a histogram for the given data. Now, mark the mid points of the upper sides of the consecutive rectangles. Also we take the imagined class interval $(-10)-0$ and $60-70$. The mid points are joined with the help of a ruler. The ends of the polygon are joined with the mid points of the imagined class intervals $(-10)-0$ and $60-70$. Now we get the frequency polygon.