1) What is the impact of variability in processing and arrival times on average waiting time?

 Why does this occur? 

2) What is the impact on average waiting time of pooling the four separate ICUs into one large ICU? Why do you think pooling has this effect?

 3) What is the impact of lower efficiency on the performance of the pooled unit versus the unspooled units? 

4) What recommendations would you give to managers of these two ICU systems?