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Chapter 8 Supplement: Advanced Waiting Line Theory and Simulation Modeling
Online Study Guide
This activity contains 15 questions.
A customer visits a florist and selects the bouquet he would like to order. He places his order with the only floor worker in the store and then pays for his order at the only cashier in the store. This is a:
single channel single phase system.
double channel, single phase system.
single channel, double phase system.
double channel, double phase system.
In most waiting line models, customers are assumed to arrive at intervals based on:
a uniform distribution.
a normal distribution.
a triangular distribution.
a Poisson distribution.
All waiting line formulas assume that customers received service on a:
shortest processing time basis.
last in, first out basis.
earliest due date basis.
first in, first out basis.
A severe ice storm paralyzed the Midwest and as he sat shivering in his dark home, Geoff decided it was time to buy a generator. He drove in to town and stopped at the first home improvement store he encountered. Much to his dismay, the line of customers extended out the door well into the parking lot. Fearing that the company would run out of this item long before he reached the department, Geoff decided against making his purchase from this business and drove on to the next business on his list.
This example illustrates what behavior when it comes to waiting line theory?
Both µ and λ are expressed as:
Fifteen seconds passes between customer arrivals to a haberdashery. This might also be expressed as:
240 customers per minute.
40 customers per minutes.
40 customers per hour.
240 customers per hour.
The sun is shining, the birds are chirping, and the local nursery is enjoying their annual spike in business. Customers arrive at the cashier at the rate of 25 per hour and can check out in 2 minutes, governed by the Poisson and exponential distributions respectively. How many customers are patiently waiting in the checkout line?
The sun is shining, the birds are chirping, and the local nursery is enjoying their annual spike in business. Customers arrive at the cashier at the rate of 25 per hour and can check out in 2 minutes, governed by the Poisson and exponential distributions respectively. How long does it take a customer to patiently wait in the checkout line and finish checking out?
The sun is shining, the birds are chirping, and the local nursery is enjoying their annual spike in business. Customers arrive at the cashier every 5 minutes and can check out in 2 minutes. Arrivals are governed by the Poisson distribution but the service time is constant. How busy is the cashier?
The cashier is busy 80% of the time.
The cashier is busy 50% of the time.
The cashier is busy 40% of the time.
The cashier is busy 60% of the time.
Joe's Hamburger Stand sells burgers and drinks. Joe decides to pull the human element out of the drink service process and installs a vending machine. In the past, the drink server could fill 50 drinks per hour and the vending machine can fill drinks at exactly the same rate, except at a constant rate. Which of the following statements is best?
There is no change in the percentage of time that the drink server is idle.
There is no change in the average time spent in the system.
There is no change in the average number of customers waiting for and receiving drinks.
There is no change in the average time spent waiting.
For both the single channel, single phase models presented in this chapter, the formula for the average time spent in the system includes the term 1/μ. What is the best description of the term 1/μ?
The service time.
The number of customers that are served.
The number of customers that are not served.
The rate that customers are not served.
The S&R Mercantile in Luther has six employees working the counter serving customers, who arrive at a rate of 40 per hour governed by a Poisson process. Service averages 7.5 minutes (distributed exponentially) regardless of which employee is providing it. How long is the average wait?
Which of these statements about simulation is best?
A less realistic simulation will be cheaper than a more realistic simulation.
Simulation models provide optimal solutions.
Simulation requires that modelers alter the actual system prior to running the simulation analyses.
The more realistic a simulation model is, the easier it will be to interpret it.
What would you expect to see if you entered =RAND()*10 in several cells of your favorite spreadsheet?
Several numbers between 1 and 100
As many numbers above 50 as there are below 50.
Several numbers between 0 and 1.
Several numbers that have an average of 5.
Which of these is an
the entrance point to the system
a customer service representative
a system workstation
customers being served
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