What is the arrival rate? $($Calls per minute$)$

Group of answer choices

$4\mathrm{.}3$

$0\mathrm{.}148$

$0\mathrm{.}154$

$6\mathrm{.}5$

$0\mathrm{.}233$

$6\mathrm{.}62$

$0\mathrm{.}098$

$7\mathrm{.}5$