Arithmetic_Mean

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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

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[[Dick Beldin]]