$\frac{{df(n)}}{{dn}};f(n) = \sum\limits_{i = \frac{n}{2}}^n {\left( {\begin{array}{*{20}{c}} n\\ i \end{array}} \right)} {p^i}{(1 - p)^{n - i}}$

Question

Pueden ayudarme a resolver esta derivada?

$\frac{{df(n)}}{{dn}};f(n) = \sum\limits_{i = \frac{n}{2}}^n {\left( {\begin{array}{*{20}{c}} n\ i \end{array}} \right)} {p^i}{(1 - p)^{n - i}}$