In one area along the interstate, the number of dropped wireless phone connections per call follows a Poisson distribution. From four calls, the number of dropped connections is

\[\begin{array}{llll}2 & 0 & 3 & 1\end{array}\]

(a) Find the maximum likelihood estimate of \(\lambda\).

(b) Obtain the maximum likelihood estimate that the next two calls will be completed without any accidental drops.