7.10. Frequency Polygons http://www.ck12.org
There is no data value greater than 0 and less than 20. The jagged line that is inserted on thex-axis is used to represent
this fact. The area under the frequency polygon is the same as the area under the histogram and is, therefore, equal
to the frequency values that would be displayed in a distribution table. The frequency polygon also shows the shape
of the distribution of the data, and in this case, it resembles a bell curve.
Example B
The following distribution table represents the number of miles run by 20 randomly selected runners during a recent
road race:
TABLE7.18:
Bin Frequency
[ 5. 5 − 10. 5 ) 1
[ 10. 5 − 15. 5 ) 3
[ 15. 5 − 20. 5 ) 2