Which one of the following is used to know the average queue length when the arrival rate and service rate are demoted by λ and μ respectively?
A. $$\frac{\lambda }{{\mu - \lambda }}$$
B. $$\frac{{{\lambda ^2}}}{{\mu \left( {\mu - \lambda } \right)}}$$
C. $$\frac{1}{{\mu - \lambda }}$$
D. $$s\frac{\lambda }{\mu }$$
Answer: Option B
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