A Single-Phase Waiting-Line System Meets the Assumptions of Constant Service

Multiple Choice

A single-phase waiting-line system meets the assumptions of constant service time or M/D/1.Units arrive at this system every 10 minutes on average.Service takes a constant 4 minutes.What is the average length of the queue L_q in units?

A) 0.4
B) 0.133
C) 4.167
D) 4.583
E) 6