★ There are 15 toolboxes, each containing a prize of a set value.
★ As the contestant, you must begin the game by randomly selecting one
toolbox. The value hidden in your chosen toolbox is what you will win if
you choose to keep it throughout the game, but you will have multiple
chances to trade it in for a guaranteed prize.
★ The game show host, the General Contractor (GC), has two roles:
○ She narrates the game.
○ She offers you the options to accept prizes of a guaranteed value at
set points during the game.
■ NOTE: When the GC makes you an offer, she determines
the amount of her offer by considering the likelihood that you
are holding a high value prize in your toolbox. If your
chances of having a big prize in your toolbox are not very
high, she will offer you a smaller prize value.
★ The image on the next page is what the game show will look like to you as
the contestant. As you play the game, this screen image will adjust with
the necessary changes.
★ This first screen shows that you randomly selected Toolbox 9, but you
don’t know what prize it contains.
The GC exclaims, “Let Round One begin! Contestant, open four toolboxes!”
The screen below shows the toolboxes you open and the corresponding values
You opened and eliminated toolboxes 3, 7, 11 and 14. They held the following
$75,000 (Bummer! This would have been enough to renovate a kitchen and
This is where your work begins.
1. Knowing that you just eliminated four prizes, calculate the average value
of all the unopened toolboxes. Show your work.
2. What is the median value of the remaining toolboxes? Show your work.
Explain why this number is important.
3. What is the mode of the values in the remaining toolboxes?
The GC says, “I will make you an offer of $7,000, and you can walk away with
that money right now. Put it toward a new home, a renovation, whatever! It’s
4. Is this a good deal? Calculate the percentage of probability that you will
win a bigger prize. Use math to explain your rationale.
You decide to keep playing—how often are you on a game show, right!?
The GC says, “Okay, let Round Two begin! Open four MORE toolboxes!”
After the second round, the screen looks like this:
You open toolboxes 1, 4, 10 and 13. The values you just eliminated include:
$100 (Great, you ruled out the possibility of getting the lowest-value home item!)
$300,000 (Wow, that would have been enough to purchase a home.)
5. Based on the values that remain, what is the probability that toolbox 9
holds the $500,000 prize?
6. You realize that you have eliminated over half of the prizes already! As
you study the remaining prize values, you consider four different
a. What is the probability that toolbox 9 contains a prize greater than
b. What is the probability that toolbox 9 contains a prize that has a 5
as one of the digits?
c. What is the probability that the value of toolbox 9 is greater than
$10,000 and has a 5 as one of the digits? Show your work.
d. What is the probability that the value of toolbox 9 is greater than
$10,000 or has a 5 as one of the digits? Show your work.
At the end of Round Two, the GC offers you $20,000 to end the game.
7. Why does the GC offer you a larger prize than she did in the first round?
Use math to explain.
8. As you prepare to start the third and final round, you wonder: What is the
probability that the next two boxes I open each have values of less than
$10,000? Show your work.
The GC exclaims, “Third and final round! This is the BONUS CHALLENGE!”
She wheels out a giant spinner with four colors on it and explains, “If you spin
two times in a row and land on the color red both times, you can take your
toolbox and automatically win another $10,000. If you land on a different color,
the value of the prize in your toolbox gets cut in half. You can either take this
challenge or stop playing now and win whatever amount is in your toolbox.”
9. What is the probability that you spin and land on the color red two times in
a row? Show your work.
10. What are the pros and cons of accepting this bonus challenge? Would you
prefer to take the challenge or call it quits and walk away with the full
value of the toolbox 9? Explain your answer.
In the end, you decide to play it safe, decline the challenge offer, and keep
toolbox 9, the box you originally chose. The value of that toolbox turns out to be
$100,000. Congratulations! You have won enough money for a large down
payment on a house! Thank you for playing Home Free!
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