A large industrial pier has two cranes that load container ships. Trucks arrive in a single line and then go to the next available crane when it is clear to do so. The arrival rate of the trucks is Poisson distributed. They arrive at a rate of 20 trucks per hour. Each crane works independently and can attach to the truck-pulled container and place it on the container ship in 4.8 minutes, on average. Crane loading activities follow an exponential distribution. How many trucks are on the pier on average?
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A large industrial pier has two cranes that load container ships. Trucks arrive in a single line and then go to the next available crane when it is clear to do so. The arrival rate of the trucks is Poisson distributed. They arrive at a rate of 20 trucks per hour. Each crane works independently and can attach to the truck-pulled container and place it on the container ship in 4.8 minutes, on average. Crane loading activities follow an exponential distribution.
How many trucks are on the pier on average?
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How does FedEx’s money-back guarantee address customers’ concerns about heterogeneity?During the campus Spring Fling, the bumper car amusement attraction has a problem with cars becoming disabled and in need of repair. One repairer can fix cars in an average time of 25 minutes. While a car is out of service either disabled and waiting to be repaired or being repaired, cars tend to break down at the rate of two per hour. Assume that there is only one repair person, the arrival rate follows a Poisson distribution and the service time follows an exponential distribution. a) On average, how long is a disabled bumper car out of service waiting to be repaired? b) On average, how many disabled bumper cars are out of service and not able to take riders on the bumper car attraction? c) When a bumper car becomes disabled, what is the probability that it will find that there is at least one other bumper car already waiting to be repaired?The computer lab at State University has a help desk to assist students working on computer spreadsheet assignments. The students patiently form a single line in front of the desk to wait for help. Students are served based on a first-come, first-served priority rule. On average, 15 students per hour arrive at the help desk. Student arrivals are best described using a Poisson distribution. The help desk server can help an average of 20 students per hour, with the service rate being described by an exponential distribution. Calculate the following operating characteristics of the service system.(a) The average utilization of the help desk server (b) The average number of students in the system(c) The average number of students waiting in line (d) The average time a student spends in the system (e) The average time a student spends waiting in line
- The Fast Shop Drive-In Market has one checkout counter where one employee operates the cash register. The combination of the cash register and the operator is the checkout counter in this waiting line system. Customers arrive at a rate of one every 3 minutes according to a Poisson distribution, and service times are exponentially distributed, with a mean rate of 30 customers per hour. a) The market manager wants to determine the following for this waiting line system: Average number of customers in the total system Average time spent in the system per customer Probability that there are more than 2 customers waiting in lineCustomers arrive at a store randomly, following a Poisson distribution at an average rate of 20 per hour. What is the probability of exactly 0, 1, 2, and 3 arrivals in a 15 minute period?