In Model $3,$ if the arrival rate is $5$ customers per hour and the service rate is also $5$ per hour, and there are two servers, the average number of customers in the system would be$?$

Group of answer choices

$0\mathrm{.}50$

$1\mathrm{.}0$

$1\mathrm{.}33$

$1\mathrm{.}83$