Spreadsheet Models for Managers

Getting Access to Spreadsheet Models for Managers

f you use Excel to model businesses, business processes, or business transactions, this course will change your life. You'll learn how to create tools for yourself that will amaze even you. Unrestricted use of this material is available in two ways.

As a stand-alone Web site: It resides on your computer, and you can use it anywhere. No need for Internet access.
At this Web site: If you have access to the Internet whenever you want to view this material, you can purchase on-line access. Unlimited usage. I'm constantly making improvements and you'll get them as soon as they're available.

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Order "Spreadsheet Models for Managers, on-line edition, one month" by credit card, for USD 69.95 each, using our secure server, and receive download instructions by return email.

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Order "Spreadsheet Models for Managers, on-line edition, three months" by credit card, for USD 199.00 each, using our secure server, and receive download instructions by return email.

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Order "Spreadsheet Models for Managers, downloadable hyperbook edition" by credit card, for USD 199.00 each, using our secure server, and receive download instructions by return email.

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Make your check payable to Chaco Canyon Consulting, for the amount indicated:

For the download: USD 199.00
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For access online for one month: USD 69.95

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Chaco Canyon Consulting
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To use the course software you'll need some other applications, which you very probably already have. By placing your order, you're confirming that you have the software you need, as described on this site.

Spreadsheet Models for Managers

Problem Set 12
Service Systems

Be sure to check the list of worksheet functions that are needed for the homework assignments, to see which new functions (if any) might help with this one.
Since macros are not permitted in this homework assignment, be certain that your workbook has no macros.
Remember that some problems are slight extensions of what we show you in demonstrations and the session notes, and some problems are somewhat ambiguous. This is intended to parallel what you'll frequently encounter at work. If you feel a bit confused, there are some things you can do to help clarify things.
Before attempting this homework, you might find it helpful to read about:

Service Systems

Numbers at the left in square brackets indicate point values.

12.1 [80]

Hamburger and fries Having originally positioned itself as an upscale burger chain, Windy's has a number of outlets that do not have drive-through service. To meet competitive pressures, Windy's has decided to install drive-through service throughout its operations. They estimate that drive-through customers will arrive, on average, every 3 minutes, and that the time to service them will be exponentially distributed with a rate of one every 2.6 minutes.

(a) [15]

Find the average number of cars in the drive-through, including both the number in line and the one being served.

(b) [15]

Find the average number of cars in line.

Find the average time (in minutes) that it takes a car to move through the line and arrive at the service window.

(d) [10]

Find the average time (in minutes) that a car takes to move through the entire drive-through system.

(e) [15]

Find the probability that there are 6 cars in the drive-through, either waiting to be, or being, served.

(f) [15]

Find the probability that there are 10 cars in the drive-through, either waiting to be served, or being served.

12.2 [20]

You've procrastinated yet again, and you're standing in line at the post office to mail your income tax form on the due date. There's only one service window open. When you arrive in the line there are 6 people in front of you, so you have some time to kill, and you try to apply what you know about service lines. As time passes, you observe that the average service time is about 2.0 minutes, and new people come into the line, on average, one every 2.5 minutes.

(a) [10]

Find the average number of people in the system including both the number in line and the one being served.

(b) [10]

Find the average length of lines when there actually is a line.

For more about my spreadsheet consulting and training services, visit SpreadsheetAce.com.

Feeling queasy about spreadsheets?

We run our companies, in part, based on spreadsheets, yet we often wonder if they're really right. Learn more about improving the reliability and effectiveness of your financial models.

With dozens of solved problems and special course tools, this course can dramatically increase your spreadsheet skills. For just USD 199.00 you receive three months of access with unlimited email support. Learn more about improving your spreadsheet sophistication and effectiveness.

Get the Hyperbook Edition of This Course

Identical to the edition you're viewing, but with dozens of solved problems and special course tools, and it stands alone — no Internet connection required. For just USD 199.00, it includes three months of unlimited email support. Learn more about improving your spreadsheet sophistication and effectiveness.

Spreadsheet Models for Managers

Getting Access to Spreadsheet Models for Managers

Spreadsheet Models for Managers

Problem Set 12
Service Systems

12.1 [80]

Instructor Contact Information

Author Contact Information

Spreadsheet Models for Managers

Getting Access to Spreadsheet Models for Managers

Spreadsheet Models for Managers

Problem Set 12Service Systems

12.1 [80]

Instructor Contact Information

Author Contact Information

Problem Set 12
Service Systems