Please answer 4 and 5, thanks!

Part 1 Arlo is the only worker at a help desk where he is able to serve customers at an average rate of 13 per hour. Customers arrive at the desk at an average rate of 10 per hour. 1. What is the probability that either 5 or 6 customers will arrive at the desk to be served in the next hour? 2. What is the average time required to serve a customer? 3. What is the probability it will take longer than 4 minutes to serve a customer? 4. Meg is walking over to the desk to get assistance. What is the probability that she will find more than two customers at the desk (either waiting in line or being served)? 5. What is the average number of customers waiting in line