Calculates the probability that a queueing system is empty of customers.
QTPMMS_PrEmpty(Arrival Rate, Service Rate, Servers)
There is an option to use a finite Queue Capacity, where customers in excess of Queue Capacity are not admitted to the queue:
QTPMMS_PrEmpty(Arrival Rate, Service Rate, Servers, Queue Capacity)
If the Queue Capacity argument is omitted, it is assumed infinite.