Recall our model of Queueing Theory$/$Waiting Line Analysis from class.

Students must have their schedule approved by an academic advisor. It takes the advisor an average of $12$ minutes to approve a schedule. Students arrive at the advisor's office at a rate of $3$ per hour.

How many students are at the advising office $($waiting and being served$)$ on average in the steady state?

$1\mathrm{.}0$

$1\mathrm{.}5$

$2\mathrm{.}5$

$2\mathrm{.}0$

$0\mathrm{.}5$