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Arithmetic Mean (A.M.) Arithmetic Mean better known as average is the most commonly used measure of central tendency. The mean of the n observations x_{1},x_{2},x_{3},x_{4}........,x_{n} is x where x = x_{1},x_{2},x_{3},x_{4}........,x_{n}/n Using the summation notation, the arithmetic mean of n observations x_{1},x_{2},x_{3},x_{4}........,x_{n} can be more simply expressed as where x = Aritmetic mean n = Number of observations x_{i} = ith observation of the variable x = summation of all x_{i} values Example
