A Weighted Average in which each quantity to be averaged is assigned a weight. It means how import of each quantity on the average.

where, **w _{i}** is the weight times.

**x _{i}** is the data number.

**x** is the weighted average.

For example, Suppose that homework counts 10%, quizzes 20%, and tests 70%, and your homework grade of 92, a test grade of 81, and a quiz grade of 68, then your grade = (0.10)(92) + (0.20)(68) + (0.70)(81) = 79.5

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