Weighted Arithmetic Mean
The weighted arithmetic mean of a set of numbers X1, X2, ..., XN with respective weights of w1, w2, ..., wN is defined as:
Example:
For a statistics course, the final exam grade is weighted four times as much as each quiz score. For a final exam grade of 82 with quiz scores of 94, 89, 92, and 85, compute the average grade.
