What is the probability the system is empty in a single$-$server model?

$0\mathrm{.}503$

$0\mathrm{.}338$

$0\mathrm{.}110$

$0\mathrm{.}098$

$0\mathrm{.}662$

$0\mathrm{.}148$

$0\mathrm{.}224$