Customers enter the camera department of a store at an average rate of five per hour. The department is staffed by one employee, who takes an average of 5.0 minutes to serve each arrival. Assume this is a simple Poisson arrival, exponentially distributed service time situation. (Use the Excel spreadsheet Queue Models.) a-1. As a casual observer, how many people would you expect to see in the camera department (excluding the clerk)? Note: Round your answer to 2 decimal places. a-2. How long would a customer expect to spend in the camera department (total time)? Note: Do not round intermediate calculations. Round your answer to 1 decimal place. b. What is the utilization of the clerk? Note: Do not round intermediate calculations. Round your answer to 1 decimal place. c. What is the probability that there are more than two people in the camera department (excluding the clerk)? Note: Do not round intermediate calculations. Round your answer to 1 decimal place