Arithmetic mean .28AM.29 Mean



the arithmetic mean (or mean ) of sample




x

1


,

x

2


,

,

x

n




{\displaystyle x_{1},x_{2},\ldots ,x_{n}}

, denoted






x
¯





{\displaystyle {\bar {x}}}

, sum of sampled values divided number of items in sample:










x
¯



=


1
n



(



i
=
1


n




x

i



)

=




x

1


+

x

2


+

+

x

n



n




{\displaystyle {\bar {x}}={\frac {1}{n}}\left(\sum _{i=1}^{n}{x_{i}}\right)={\frac {x_{1}+x_{2}+\cdots +x_{n}}{n}}}








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