Develop a managerial report summarizing your analysis of the OEI service capabilities. Make recommendations regarding the number of technicians to be used when OEI reaches $20$ customers and when OEI reaches $30$ customers. Include a discussion of the following issues in your report:

What is the arrival rate for each customer per hour?

What is the service rate in terms of the number of customers per hour? Note that the average travel time of $1$ hour becomes part of the service time because the time that the service technician is busy handling a service call includes the travel time plus the time required to complete the repair.