VCustomers arrive at a Service Ontario centre with inter$-$arrival times averaging $5$ minutes. The variance of the inter$-$arrival times is equal to $9$ minutes squared. What is the coefficient of variation for the inter$-$arrival times? $($pick the choice that is closest to your answer$).$

Note: Variance is equal to the square of standard deviation.

Question $12$ options:

$1\mathrm{.}2$

$0\mathrm{.}6$

$0\mathrm{.}2$

$0\mathrm{.}8$

$0\mathrm{.}4$