Mcgraw-Hill: Mean-Median-Mode
http://highered.mcgraw-hill.com/sites/dl/free/0072868244/124727/MeanMedianMode.html


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This site shows three different graphs (no skew, right skewed, left skewed) and how mean, median, and mode react to each graph.

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Subject: Mathematics
Resource Type: Activities:Lab Activity, Classroom Activity
Special Interest: Quantitative
Grade Level: College Upper (15-16), College Lower (13-14), Intermediate (3-5), High School (9-12), Middle (6-8)
Quantitative Skills: Probability and Statistics:Describing Data Distribution