Customers enter the camera department of a store with an average of $12\mathrm{.}24$ minutes between customers. The department is staffed by one employee, who can handle an average of $13\mathrm{.}31$ customers per hour. Assume this is a simple Poisson arrival, exponentially distributed service time situation. Find the following information to help the manager decide if a second employee should be added:Part a: The avege time customers wAites