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The following table shows the average rainfall in 150 towns. Show the information by a frequency polygon.

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The following table shows the average rainfall in 150 towns. Show the information by a frequency polygon.

Average rainfall (cm) 0 - 20 20 - 40 40 - 60 60 - 80 80 - 100
No. of towns 14 12 36 48 40
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Class Average rainfall (cm) 0 - 20 20 - 40 40 - 60 60 - 80 80 - 100 100 - 120
Class mark 10 30 50 70 90 110
Frequency (No. of towns) 14 12 36 48 40 0
Co-ordinates of points (10, 14) (30, 12) (50, 36) (70, 48) (90, 40) (110, 0)

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