Step 1

Independent repeated trials of an experiment with two outcomes only are called Bernoulli trials. Call one of the outcomes "success" and the other outcome "failure". Let p be the probability of success in a Bernoulli trial. Then the probability of failure q is given by

\(\displaystyle{q}={1}-{p}\)

\(P(k)=\left(\begin{array}{c}n\\ k\end{array}\right) p^{k} q^{n-k}\)

Step 2

by calculating the probability of giving

\(\displaystyle{p}{\left({0}\right)}+{p}{\left({1}\right)}+{P}{\left({2}\right)}+{p}{\left({3}\right)}+{p}{\left({4}\right)}={.7651}\)