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A frequency distribution can be shown using a frequency polygon. 5 Frequency Polygons Frequency Marks Test Scores A Frequency Polygon can be drawn onto an existing histogram.1. Mark the mid - points of each bar at the top with a point.2. Draw in straight lines connecting points.3. Extend lines if necessary ½ a class interval beyond first and last bars

Frequency Polygons Frequency Time in minutes Time Taken for Race 60

Frequency Polygons Frequency Temperature o C 35 Maximum Daily Temperature as Recorded by a Gardener

Worksheet 1 Frequency Polygons

A frequency polygon can be drawn directly from the frequency table by finding the mid-point of each class interval Frequency Marks Test Scores Marks5 – 910 – 1415 – 1920 – frequency

Frequency Time in minutes Time Taken for Race 60 A frequency polygon can be drawn directly from the frequency table by using by finding the mid-point of each class interval. Time10 – 2020 – 3030 – 4040 – frequency

Frequency Temperature o C 35 Maximum Daily Temperature as Recorded by a Gardener Time10 – 1515 – 2020 – 2525 – frequency A frequency polygon can be drawn directly from the frequency table by using by finding the mid-point of each class interval.

Worksheet 2

Frequency Marks Test Scores It is often useful to show frequency polygons, side by side, in order to compare distributions. The same 55 students sat two separate maths tests. The scores for each are shown by the frequency polygons below. Comment on the differences. Test 1 Test 2

Frequency Temperature o C 35 Maximum Daily Temperature as Recorded by a Gardener A gardener recorded the maximum daily temperature on 48 days throughout the year She repeated this for the same dates in Comment on the differences in temperature for these years