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\begin{document}
\handout{tut13}{Tutorial 13 Problems}{May 8, 1996}
\begin{problems}
\problem Let $X$ and $Y$ be two independent Poisson random variables with
parameters $\lambda_1$ and $\lambda_2$ respectively.  What distribution does
$X+Y$ have?

\problem Let $X$ be a random variable with a Poisson distribution with
parameter $\lambda$.  Show that its mean and variance are both $\lambda$.

\end{problems} 

\end{document}
