Exam 21: The Modi and Vam Methods of Solving Transportation Problems

A finite population waiting line model has an average service time T of 100 minutes and an average time between service requirements U of 400 minutes; the service factor X is

A waiting line, or queuing, system has three parts, which are

Students arrive randomly at the help desk of the computer lab. There is only one service agent, and the time required for inquiry varies from student to student. Arrival rates have been found to follow the Poisson distribution, and the service times follow the negative exponential distribution. The average arrival rate is 12 students per hour, and the average service rate is 20 students per hour. What is the utilization factor?

There is only one bay and one type of service at an automatic car wash. Provide the most likely characteristics of this system. a. name of model b. number of channels c. number of phases d. arrival rate distribution e. service time distribution f. population size g. queue discipline

A waiting-line system that meets the assumptions of M/M/1 has λ = 1, μ = 4. For this system, the probability of more than two units in the system is approximately

A waiting-line system that meets the assumptions of M/M/S has λ = 5, μ = 4, and M = 2. For these values, P_o is approximately 0.23077 and L_s is approximately 2.05128. The average time a unit spends in this system

Which of the following is a measure of queue performance?

"Women and children first!" declares the captain of a sinking ship. His directive employs which of the following queue disciplines in disembarking passengers?

In queuing problems, which of the following probability distributions is typically used to describe the number of arrivals per unit of time?

Students arrive randomly at the help desk of a computer lab. There is only one service agent, and the service time varies from one student to the other. Provide the most likely characteristics for this system. a. name of model b. number of channels c. number of phases d. arrival rate distribution e. service time distribution f. population size g. queue discipline

Of the three types of queue discipline, only __________ is assumed by the four primary waiting line models.

A system in which the customer receives service from only one station and then exits the system is

What is queue discipline? State three rules for queue discipline. Which of these rules appears most frequently in the four main models?

Suppose that a fast food restaurant wants the average line to be 4 customers and that 80 customers arrive each hours. How many minutes will the average customer be forced to wait in line?

A single-phase waiting-line system meets the assumptions of constant service time or M/D/1. Units arrive at this system every 10 minutes on average. Service takes a constant 4 minutes. The average length of the queue L_q is

A small hair styling salon has several operators. While customers do not have appointments, each is waiting to be served by a specific operator. This scenario provides an example of a

A waiting line meeting the assumptions of M/M/1 has average time between arrivals of 20 minutes and services items in an average of 10 minutes each; the utilization factor is approximately

As the average service rate μ increases, the shape of the negative exponential distribution of service times

The __________ probability distribution is a continuous probability distribution often used to describe the service time in a queuing system.

A(n) __________ queuing system has one line and one server.