Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!
back to [[Summary Statistics]] The '''Arithmetic Mean''' is defined as the sum of all the members of a set of data divided by the number of items in the set. If the set used is a [[Population]], then we speak of the [[Population Mean]]. When the set is a [[Sample]], we call the [[Statistic]] a [[Sample Mean]].n ___ _ 1 \ x = --- . x n /___ i---- [[Dick Beldin]]