Question: Consider the M/M/s system below with metrics for s = 2 and s = 3. Input characteristics: Mean arrival rate (lambda): 9 per hour Mean

Consider the M/M/s system below with metrics for s = 2 and s = 3. Input characteristics: Mean arrival rate (lambda): 9 per hour Mean service rate (mu): 8 per hour Performance metrics: Number of servers (s): 2 3 Mean time in the system (W): 0.183 hours 0.133 hours 0.008 hours 0.375 Mean time in the queue (Wa): 0.058 hours Utilization factor (rho): 0.563 Probability of zero units in 0.280 system (PO): 0.320 Considering s = 2, what proportion of time is at least one server busy? Select one: a. 0.720 b. 0.563 c. 0.283 d. 0.280

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