weighted average

The weighted mean of a discrete set of numbers {x_1, x_2, ..., x_n} with weights {w_1, w_2, ..., w_n} is given by 〈x〉 = sum_(i = 1)^n w_i x_i, where each weight w_i is a nonnegative real number and sum_(i = 1)^n w_i = 1.

arithmetic mean | mean