1. Ten customers visit TimBuk2 Bakery from 8 a.m. to 10 a.m. The customers spend 10, 15, 20, 11, 8, 12, 5, 18, 29, and 32 minutes in the bakery. A. What is the average flow time (in minutes) of a customer at this bakery? B. On average, how many customers are in the bakery from 8 a.m. to 10 a.m.?

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter12: Queueing Models
Section12.5: Analytic Steady-state Queueing Models
Problem 9P
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1. Ten customers visit TimBuk2 Bakery from 8 a.m. to 10 a.m. The customers spend 10, 15, 20,
11, 8, 12, 5, 18, 29, and 32 minutes in the bakery.
A. What is the average flow time (in minutes) of a customer at this bakery?
B. On average, how many customers are in the bakery from 8 a.m. to 10 a.m.?
2. Arrivals and departures to Star Optometrist are collected and reported below:
Patient
1
2
3
4
5
Customers/
Take
Orders
Arrival
7:45
8:00
A. What is the average flow time of its patients in minutes?
B. Assume Star Optometrist is open from 7:45 a.m. to noon. What is the flow rate of patients
in Star Optometrist per hour?
10:00
10:15
10:35
C. Assume Star Optometrist is open from 7:45 a.m. to noon. How many patients on average
are in Star Optometrist?
3. SCM301 Warehouse takes orders from 7 a.m. to 7 p.m. The manager wants to analyze the
process and has provided the following process flow diagram. There are three steps required
to ship a customer order. The first step is to take the order from a customer. The second step is
to pick the order for the customer, and then they have to pack the order to ready it for shipping.
The order-taking step works at a maximum rate of 100 customer orders per hour. Order picking
works at a maximum of 80 per hour, and packing works at 60 per hour.
100 Customers/
Departure
8:45
9:00
10:30
11:45
12:00
Customer
Orders,
Pick
Orders
Picked
Orders/
80 Customers/
hour 01) vib-listhouriant avel
Pack
Orders
60 Customers/
hour
Wait for
Shipper
SCM301 Warehouse wants to figure out the following:
A. What is the current maximum output of the process assuming that no one works overtime?
(For your answers to these questions, assume that everyone can start working at 7 a.m.)
B. How long will the picking and packing operations have to work if we have a day where the
order taker works at his maximum capacity all day?
C. Given b, what is the maximum number of orders waiting to be picked?
D. Given b, what is the maximum number of orders waiting to be packed?
E. If we double the packing capacity (from 60 to 120 orders per hour), what impact does this
have on your answers in parts (b), (c), and (d)?
Transcribed Image Text:1. Ten customers visit TimBuk2 Bakery from 8 a.m. to 10 a.m. The customers spend 10, 15, 20, 11, 8, 12, 5, 18, 29, and 32 minutes in the bakery. A. What is the average flow time (in minutes) of a customer at this bakery? B. On average, how many customers are in the bakery from 8 a.m. to 10 a.m.? 2. Arrivals and departures to Star Optometrist are collected and reported below: Patient 1 2 3 4 5 Customers/ Take Orders Arrival 7:45 8:00 A. What is the average flow time of its patients in minutes? B. Assume Star Optometrist is open from 7:45 a.m. to noon. What is the flow rate of patients in Star Optometrist per hour? 10:00 10:15 10:35 C. Assume Star Optometrist is open from 7:45 a.m. to noon. How many patients on average are in Star Optometrist? 3. SCM301 Warehouse takes orders from 7 a.m. to 7 p.m. The manager wants to analyze the process and has provided the following process flow diagram. There are three steps required to ship a customer order. The first step is to take the order from a customer. The second step is to pick the order for the customer, and then they have to pack the order to ready it for shipping. The order-taking step works at a maximum rate of 100 customer orders per hour. Order picking works at a maximum of 80 per hour, and packing works at 60 per hour. 100 Customers/ Departure 8:45 9:00 10:30 11:45 12:00 Customer Orders, Pick Orders Picked Orders/ 80 Customers/ hour 01) vib-listhouriant avel Pack Orders 60 Customers/ hour Wait for Shipper SCM301 Warehouse wants to figure out the following: A. What is the current maximum output of the process assuming that no one works overtime? (For your answers to these questions, assume that everyone can start working at 7 a.m.) B. How long will the picking and packing operations have to work if we have a day where the order taker works at his maximum capacity all day? C. Given b, what is the maximum number of orders waiting to be picked? D. Given b, what is the maximum number of orders waiting to be packed? E. If we double the packing capacity (from 60 to 120 orders per hour), what impact does this have on your answers in parts (b), (c), and (d)?
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