Statistical Glossary
Weighted Mean (Calculation):
To simplify calculation of the weighted mean , weights 
are often standardized to make their sum equal to the unit value, i.e. by dividing every weight 
by the total sum of all weights:
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Then, the weighted mean 
is computed using weights 
, standardized according to the above expression, from the following formula:
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See also: mean values (comparison) and the online short course Basic Concepts in Probability and Statistics