Problem $18-1($Algo$)$

Repair calls are handled by one repairman at a photocopy shop. Repair time, including travel time, is exponentially distributed, with a mean of $1\mathrm{.}1$ hours per call. Requests for copier repairs come in at a mean rate of $1\mathrm{.}6$ per eight$-$hour day $($assume Poisson$).$ Determine the following:

a$.$ The average number of customers awaiting repairs. $($Round your answer to $2$ decimal places.$)$