

\subsection{\bf Telephone Calls as a Birth Process---II}

\begin{slide}
\begin{itemize}
\item Note mean number received is $pt$ or for $t=3600$, just $N$ as
input data claimed.

\item One could also derive this by taking each second as a Bernoulli
trial with probability $p$ of success.

\item Then we get distribution $b(k,t,p)$ which has
$t\rightarrow\infty$, $p\rightarrow 0$: $pt$ finite, i.e., we can
employ usual Poisson limit.
\end{itemize}
\end{slide}
