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weighted mean

If in a series of observations a statistical weight(w i) is assigned to each value, a weighted mean x ̄ w can be calculated by the formula:
x ̄ w = ∑ w i x i ∑ w i
Unless the weights can be assigned objectively, the use of the weighted mean is not normally recommended.
PAC, 1994, 66, 595 (Nomenclature for the presentation of results of chemical analysis (IUPAC Recommendations 1994)) on page 599
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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