A manager is trying to improve a single-server queing system through automation. the average service time is 20 minutes per customer, exponentially distributed, and the arrival rate is 16 customers per 8-hour day (poisson arrivals). the automated system will have constant service time of 16 minutes. the effect of this change will:
1) decrease utilization 2) increase waiting time 3) decrease waiting time 4) have no effect since service time is unchanged.