Please complete questions 1 through 4. No extra information needed thank you.

The women's department at Hector's Department Store has a single checkout register. Customers arrive at the register at the rate of 13 per hour. It takes the clerk, on average, 4 minutes to check out a customer. 1. What is the average number of customers waiting to be checked out? 2. How long (minutes) on average, will a customer have to wait before the clerk starts serving him or her? 3. Hector's Department Store has decided to add a second checkout register. This second register works at the same average speed as the first. Customer arrivals are the same as before. What is the average number of customers waiting to be checked out now? 4. On average, how long (minutes) will a customer have to wait now before the clerk starts serving him or her