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Wolfram Research

Wolfram Math World: Frequency Distribution

For Students 9th - 10th Standards
This site from MathWorld provides a general overview of frequency distribution, complete with a bar graph and explanatory text.
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ClassFlow

Class Flow: Cumulative Frequency Data Handling

For Teachers 9th - 10th Standards
[Free Registration/Login Required] Students draw conclusions and engage in tables and charts involving cumulative frequency; a wonderful review of student's knowledge.