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Calculating a weighted average

If all the weights are equal, then the weighted mean is the same as the arithmetic mean. While weighted means generally behave in a similar fashion to arithmetic means, they do have a few counter-intuitive properties, as captured for instance in Simpson's paradox.

Weighted versions of other means can also be calculated. Examples of such weighted means include the weighted geometric mean and the weighted harmonic mean.

The notion of weighted mean plays a role in descriptive statistics and also occurs in a more general form in several other areas of mathematics.

In the special case, often encountered in practice, where the weights are normalized (i.e. are nonnegative and sum up to 1), the denominator of the fraction simplifies to 1.

see also newest formulas Acceleration Calculating a weighted average Pregnancy Date Calculator Fill the yellow fields to see the result in the green fields!   A B C 1 Weighted average      2       3   Cost  Staff  4 Grade A      5 Grade B      6 Grade C      7       8 Average      9 Wtd Avg      © formularium.org was this helpful ? see also: http://en.wikipedia.org/wiki/Weighted_average link: http://formularium.org?go=128 (use this link to publish this page) Export:  Excel-Export Script: <script src="http://formularium.org/js.php?go=128"></script> (use this script to include this spreadsheet onto your own webpageExport)   (source: Weighted mean. (2007, September 22). In Wikipedia, The Free Encyclopedia. Retrieved 06:44, October 21, 2007, from http://en.wikipedia.org/w/index.php?title=Weighted_mean&oldid=159628965) did you know that you can integrate any formula into your own homepage? try it! insert this code into your page: <script src="http://formularium.org/js.php?go=128"></script>