Exam 25: Queuing Models

A finite population waiting line model has an average service time T of 200 minutes and an average time between service requirements U of 300 minutes.What is the service factor X?

Why must the service rate be greater than the arrival rate in a single-server system?

A large discount store and supermarket has a hair styling salon on its premises.The salon has several operators.Salon customers can shop in other parts of the store until their name is called for salon service,at which time the customer will be served by the next available stylist.This scenario provides an example of which of the following?

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

A(n)________ queuing system has one waiting line,but several servers;a(n)________ queuing system is one in which the customer receives services from several stations before exiting the system

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.What is the average length of the queue Lq in units?

Arrivals or inputs to a waiting-line system have characteristics that include:

The cost of waiting decreases as the service level increases.

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.What is the service factor X?

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.A student has just entered the system.How long is she expected to stay in the system?

The ________ of a waiting line and the probability that the queue is empty add to one.

The common measures of a queuing system's performance include:

Which of the following represents a customer that reneged due to the waiting line?

A waiting line meeting the M/M/1 assumptions has an arrival rate of 4 per hour and a service rate of 12 per hour.What is the probability that the waiting line is empty?

A waiting line meeting the assumptions of M/M/1 has an average time between arrivals of 20 minutes,and it services items in an average of 10 minutes each.What is the utilization factor?

A college registrar's office requires you to first visit with one of three advisors and then with one of two financial professionals.This system is best described as which of the following?

Which part of a waiting line has characteristics that involve a statistical distribution?

In the basic queuing model (M/M/1),what probability distribution describes service times?

The sign at the bank that reads,"Wait here for the first available teller," suggests the use of a ________ waiting line system.

An airline ticket counter,with several agents for one line of customers,is an example of which of the following?