Frequency Polygons

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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.

                                        (http://tutorteddy.com/images/frequency-polygon-drawn-over-the-histogram.gif)

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