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# Weighted Average question

 P: n/a http://www.mathwords.com/w/weighted_average.htm At the above link gives an example of a weighted average. It uses the following example: Grades are often computed using a weighted average. Suppose that homework counts 10%, quizzes 20%, and tests 70%. If Pat has a homework grade of 92, a quiz grade of 68, and a test grade of 81, then Pat's overall grade = (0.10)(92) + (0.20)(68) + (0.70)(81) = 79.5 I have created a weighted average similar to the above model for quality assurance. And it works fine. Now I've been asked to provide a weighted average for the price of the project. How does one "blend" or "merge" two weighted averages together? Does one simply add the weighted averages together and divide by the number of averages...or does one assign weights to each weighted average to determine the weighted average of the weighted averages? (That's a tongue twister). Anyway, if you have any input on weighted averages I'd appreciate your insite. Sep 5 '07 #1