Weighted Mean Explained Using Summations
http://infinity.cos.edu/faculty/woodbury/Stats/Tutorial/CT_WeightedMean.htm


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This site explains how to calculate weighted means in a more sophisticated manner, e.g., summations; includes an example.

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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