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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