Frequency Polygons

1. Find midpoints

2. Plot points at the midpoints on the graphs

3. Join each point together to make a straight line between points.

• Midpoint = (lowest integer + highest integer) / 2

e.g 10<t<14  (10+14)/2 = 12 = midpoint

• When drawing a frequency polygon on a graph with no axis make sure the frequency is ALWAYS on the y axis
• If drawing a histogram on the same graph, the frequency polygon touches the tops of the bars.