A small branch of Citi Bank has only one ATM. Customers arrive on average every $5$ minutes and spend $3$ minutes on average at the ATM. Assume CVa $=1$ and CVp $=1.$

What is the average length of the queue waiting for the ATM $($Iq$)?$

Group of answer choices

$5\mathrm{.}3$ customers

$1\mathrm{.}8$ customers

$3\mathrm{.}2$ customers

$0\mathrm{.}9$ customers