Analyze frequency distribution with tables and polygon charts.
Data & Settings
Distribution Analysis
Class Interval
Midpoint
Frequency
Relative Freq.
Cumulative Freq.
10 - 20
15
4
26.7%
4
20 - 30
25
4
26.7%
8
30 - 40
35
3
20.0%
11
40 - 50
45
3
20.0%
14
50 - 60
55
1
6.7%
15
About this calculator
Overview
A frequency polygon is a line graph of class frequency plotted against class midpoint. It creates a polygon shape to show the distribution shape closer than a histogram.
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Pro Tips
Class Midpoint = (Lower Limit + Upper Limit) / 2
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Fun Facts
"Polygon graphs are often better for comparing multiple distributions than histograms."
"The area under the frequency polygon represents the total number of frequencies."
