A queuing model that follows the M$/$M$/1$ assumptions has $\backslash$lambda $=3$ and $\backslash$mu $=2.$ What is the average number of units in the system?

Group of answer choices

$150$ percent

$-3$

Growing without limit$,$ since $\backslash$lambda is larger than $\backslash$mu $.$

$0\mathrm{.}667$

$3$