Everything man, car, machine is looking for or waiting to be served is called a customer. Service points are called Servers. The number of customers arriving for service in the time unit is not stable in most cases, as the number of served customers is usually not constant. Queues are created when the capacity of a service system as determined by the number of service locations and service rates of each one is not sufficient to meet demand. However, there are also cases where the capacity of the service system is adequate, but waiting queues are created. The main reason for creating queues is the fact that in all systems there is a degree of uncertainty about the outcome of various events occurring in them. Uncertainty in a service system occurs in various forms.These regular arrivals are served by FCFS. At t there are no waiting clients and the channel is empty. Let x the number of arrivals in unit time and/ λ the fixed time between consecutive arrivals. The time unit is selected by the analyzer. However, the unit of time selected must be observed throughout the process. Similarly, if μ is the service rate, then/ μ is the fixed service time. We want to calculate the number in the system at a random t time, let n t, and the time that the nth client arrives must wait in the queue to serve, let Wq n. We can measure the effectiveness of the above. Assuming that when one service ends another begins, the number in the system.

Everything man, car, machine is looking for or waiting to be served is called a customer. Service points are called Servers. The number of customers arriving for service in the time unit is not stable in most cases, as the number of served customers is usually not constant. Queues are created when the capacity of a service system as determined by the number of service locations and service rates of each one is not sufficient to meet demand. However, there are also cases where the capacity of the service system is adequate, but waiting queues are created. The main reason for creating queues is the fact that in all systems there is a degree of uncertainty about the outcome of various events occurring in them. Uncertainty in a service system occurs in various forms.