1c,d

1 Staffing at the Optimal Utilization A large grocery store is attempting to staff its check-out registers. Currently, the arrival rate is =320 customers per hour, each server has a service time of E[T]=3.75 minutes on average, and the interarrival and service times follow an exponential distribution. What is the distribution of the service time T ? a. T-Exponential(20) b. T-Exponential(3.75) c. T Exponential(16) d. T-Exponential(320) Clear my choice What is the marginal probability that a customer's service time will be greater than three minutes (0.05 hours ), that is P(T>0.05) ? a. 0.83 b. 0.64 C. 0.45 d. 0.37 Clear my choice