A small town post office employs a single postal worker. Customers arrive at the postal branch at a rate of $30$ customers per hour. The average service time at the post office is $1\mathrm{.}5$ minutes per customer. Calculate the following performance measures for this M$/$M$/1$ system.

$=$

$=$

$=\frac{}{}=$

$L=\frac{}{-}=$

$L_Q=L=$

$W=\frac{1}{-}=$

$W_Q=W=$

$P_{10}=(1-){}^{10}=$

$P_{15+}={}^{16}=$

What are your conclusions about the performance of the post office's waiting system?