Considering any one of the individual s* queues, derive the expected number of customers waiting in line. O a. 8.1 customers O b. 3.2 customers O c. 0.9 customers O d. 2.25 customers For any one of the individual s* queues, what is the expected waiting time (minutes) spent in line for a customer? O a. 4 minutes O b. 15 minutes O c. 10 minutes O d. 38 minutes