A service facility consists of one server who can serve an average of two customers per hour (service times are exponential). An average of three customers per hour arrive at the facility (interarrival times are assumed to be exponential). The system capacity is three customers: two waiting and one being served. What is the probability that the server is busy at a typical point in time? If needed, round your answer to a whole percentage. The excel formula breaks the answer down to 0.8769. However 0.87 or 1% is showing as wrong answer.

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter5: Network Models
Section: Chapter Questions
Problem 51P
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A service facility consists of one server who can serve an average of two customers per hour (service times are exponential). An average of three customers per hour arrive at the facility (interarrival times are assumed to be exponential). The system capacity is three customers: two waiting and one being served. What is the probability that the server is busy at a typical point in time? If needed, round your answer to a whole percentage.

The excel formula breaks the answer down to 0.8769. However 0.87 or 1% is showing as wrong answer. 

Inputs
Unit of time
hour
Arrival rate
3
customers/hour
Service rate
Number of servers
2
customers/hour
Calculate steady-state
quantities
Maximum customers in system
3
customers
Maximum queue length
2
customers
Outputs
Steady-state probabilities
Summary measures
Pn
0 0.1231
1 0.1846
Expected number in system
1.985
customers
Expected number in queue
1.108
customers
Expected time in system
1.132
hours
2 0.2769
Expected time in queue
0.632
hours
3 0.4154
Entering rate
Percentage who don't wait in queue
1.754
customers/hour
12.3%
Probability server is busy
0.8769
Transcribed Image Text:Inputs Unit of time hour Arrival rate 3 customers/hour Service rate Number of servers 2 customers/hour Calculate steady-state quantities Maximum customers in system 3 customers Maximum queue length 2 customers Outputs Steady-state probabilities Summary measures Pn 0 0.1231 1 0.1846 Expected number in system 1.985 customers Expected number in queue 1.108 customers Expected time in system 1.132 hours 2 0.2769 Expected time in queue 0.632 hours 3 0.4154 Entering rate Percentage who don't wait in queue 1.754 customers/hour 12.3% Probability server is busy 0.8769
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The following problem is based on the limited queue and limited source models in the Limited Queue Template.xlsm and Limited Source Template.xlsm files.
A service facility consists of one server who can serve an average of two customers per hour (service times are exponential). An average of three customers per hour arrive at the facility (interarrival
times are assumed to be exponential). The system capacity is three customers: two waiting and one being served.
a. On average, how many potential customers enter the system each hour?
needed, round your answer to one decimal digit.
1.7
b. What is the probability that the server is busy at a typical point in time? If needed, round your answer to a whole percentage.
1
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Transcribed Image Text:* CENGAGE MINDTAP Q Search this Week 7: Chapter 12 Homework Assignment: Week 7: Chapter 12 Homework Assignment Score: 83.33% Save Submit Assignment for Grading Questions wapms06h.ch12.24 « Question 3 of 3 1. Check My Work Spreadsheet eBook The following problem is based on the limited queue and limited source models in the Limited Queue Template.xlsm and Limited Source Template.xlsm files. A service facility consists of one server who can serve an average of two customers per hour (service times are exponential). An average of three customers per hour arrive at the facility (interarrival times are assumed to be exponential). The system capacity is three customers: two waiting and one being served. a. On average, how many potential customers enter the system each hour? needed, round your answer to one decimal digit. 1.7 b. What is the probability that the server is busy at a typical point in time? If needed, round your answer to a whole percentage. 1 " Hide Feedback Partially Correct
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ISBN:
9781337406659
Author:
WINSTON, Wayne L.
Publisher:
Cengage,