Wikipedysta:Mfloryan/brudnopis

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${\displaystyle {\bar {x}}_{r}={\frac {1}{c}}\sum _{c}x_{c,r}}$
${\displaystyle {\bar {x}}_{c}={\frac {1}{r}}\sum _{r}x_{c,r}}$
${\displaystyle {\bar {x}}={\frac {1}{rc}}\sum _{r,c}x_{c,r}={\frac {1}{r}}\sum _{r}({\frac {1}{c}}\sum _{c}x_{r,c})={\frac {1}{r}}\sum _{r}{\bar {x}}_{r}}$

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