Weighted Average (1) (Data Analysis) For a series of recorded observations, the sum of the products of the frequency of certain values and the value of the observation, divided by the total number of observations. For example, for one measurement of 5 grams, three measurements of 7 grams, and two measurements of 2 grams, the weighted average is 1(5) + 3(7) + 2(2)/6 = 5 grams. (2) (USGS) Used to indicate discharge-weighted average. It is computer by multiplying the discharge for a sampling period by the concentrations of individual constituents for the corresponding period and dividing the sum of the products by the sum of the discharges. A discharge- weighted average approximates the composition of water that would be found in a reservoir containing all the water passing a given location during the water year after thorough mixing in the reservoir.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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