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![\begin{gathered}<br />
\sum\limits_{k = 1}^n {\left( {x_k - a} \right)} = \left( {\sum\limits_{k = 1}^n {x_k } } \right) - na \hfill \\<br />
\frac{1}<br />
{n}\left[ {\left( {\sum\limits_{k = 1}^n {x_k } } \right) - na} \right] = \frac{1}<br />
{n}\left( {\sum\limits_{k = 1}^n {x_k } } \right) - a \hfill \\ <br />
\end{gathered} <br />](http://latex.codecogs.com/png.latex?\begin{gathered}<br />
\sum\limits_{k = 1}^n {\left( {x_k - a} \right)} = \left( {\sum\limits_{k = 1}^n {x_k } } \right) - na \hfill \\<br />
\frac{1}<br />
{n}\left[ {\left( {\sum\limits_{k = 1}^n {x_k } } \right) - na} \right] = \frac{1}<br />
{n}\left( {\sum\limits_{k = 1}^n {x_k } } \right) - a \hfill \\ <br />
\end{gathered} <br />
)
<- What the heck happened with that
thing? The transformation from the previous step, to this one, and the next step?
By the way on the x on the left hand side there should be a little bar on top, indicating average.
Thanks for any help.
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Originally Posted by Plato 
