Wolfram Research
Wolfram Math World: Frequency Distribution
This site from MathWorld provides a general overview of frequency distribution, complete with a bar graph and explanatory text.
Wolfram Research
Wolfram Math World: Frequency Polygon
MathWorld provides a general overview of a frequency polygon, complete with a graphical example.
Other
Grinnell College: Histograms Area of Rectangles
A sample problem is provided to help you create a histogram using a frequency distribution chart. Sample charts and formulas are provided to help explain how to find the area of the rectangles in the histogram and how to interpret what...