This site explains how to calculate weighted means in a more sophisticated manner, e.g., summations.
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Subject: Mathematics Resource Type: Activities:Classroom Activity Special Interest: Quantitative Grade Level: College Lower (13-14), College Upper (15-16), Middle (6-8), High School (9-12), Intermediate (3-5) Quantitative Skills: Probability and Statistics:Describing Data Distribution
CMS authors: link to this resource in your page using [resource 41017]