Question $3$

The DMV only has one clerk working. Customers arrive every $10$ minutes and it

takes the service clerk $5$ minutes to process each customer.

What is the system utilization:

How long will a customer be at the DMV$?0\mathrm{.}5$ hours

What is the probability there are at least $5$ customers in line?

Answer $1$:

$\mathrm{.}5$

Answer $2$:

$0\mathrm{.}5$ hours

Answer $3$:

$\mathrm{.}0156$

I believe one of the answer was wrong or maybe it wrong somewhere. Hope you can help me$!$