In a queuing model the fundamental relationship defining the expected number of units in the queue, `L_q`, dependent on the mean arrival rate and the expected waiting time in the queue.
Thus the fundamental relationship is: `L_q` = `lamda * W_q`
When the inputs are define by a Poisson distribution and service times are defined by an Elang distrbution, `sigma^2` = 1/(k`mu^2'), in this case the expected number of units in the queue, `L_q`, is computed by this equation.
Inputs are: