Question $18$

$2\mathrm{.}25$ pts

Consider an espresso stand with a single barista. Customers arrive at the stand at the rate of $10$ per hour, according to a Poisson distribution. Service times are exponentially distributed with a service rate of $25$ customers per hour. The average time in minutes a customer spends in the system $($i$.$e$.,$ waiting and being served$)$ is minutes.

$6$

$5$

$4$

$3$