arithmetic mean (average)
The sum of a series of observations divided by the number of observations. Symbol:
. It can be calculated by the formula:
All summations are taken from 1 to .
Note that the arithmetic mean is an unbiased estimate of the population mean, i.e.
is the limiting value for ,
PAC, 1994, 66, 595
(Nomenclature for the presentation of results of chemical analysis (IUPAC Recommendations
on page 599