Consider the queue of complaints about water main breaks $($broken pipelines in the Washington DC infrastructure$)$ arriving to the website or the call center of DC Water. DC Water is in charge of managing and maintaining the water supply throughout the city and is responsible for repairing the infrastructure. All calls$/$complaints require dispatching a crew to the location and fixing the problem.

Answer the questions below for a queueing model of the DC Water repair services. There is one queue and one server. The complaints are served in the order they arrive.