In a one$-$server model, what is the probability of less than $3$ customers in the system?

$0\mathrm{.}386$

$0\mathrm{.}361$

$0\mathrm{.}278$

$0\mathrm{.}092$

$0\mathrm{.}150$

$0\mathrm{.}128$

$0\mathrm{.}108$