red_pe_ch_10.pdf

# 26 precision you randomly choose one of the cards and

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26. Precision You randomly choose one of the cards and set it aside. Then you randomly choose a second card. Describe how the number of possible outcomes changes after the first card is chosen. Baker Dancer cer Pirate Firefighter e ef f fi efi refi refig Firefight r er ter Bellhop h lh llh llho ellho Spinner A Spinner B . Susan B. Anthony dollar Presidential dollar Kennedy half-dollar 5 in. 6 in. 12 in.

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406 Chapter 10 Probability and Statistics Probability 10.2 How can you describe the likelihood of an event? Work with a partner. You work for a game company. You need to create a game that uses the spinner below. a. Write rules for a game that uses the spinner. Then play it. b. After playing the game, do you want to revise the rules? Explain. c. CHOOSE TOOLS Using the center of the spinner as the vertex, measure the angle of each pie-shaped section. Is each section the same size? How do you think this affects the likelihood of spinning a given number? d. Your friend is about to spin the spinner and wants to know how likely it is to spin a 3. How would you describe the likelihood of this event to your friend? ACTIVITY: Black-and-White Spinner Game 1 Probability and Statistics In this lesson, you will understand the concept of probability and the relationship between probability and likelihood. find probabilities of events.
Section 10.2 Probability 407 Work with a partner. For each spinner, do the following. Measure the angle of each pie-shaped section. Tell whether you are more likely to spin a particular number. Explain your reasoning. Tell whether your rules from Activity 1 make sense for these spinners. Explain your reasoning. ACTIVITY: Changing the Spinner 2 Work with a partner. Apply the following rules to each spinner in Activities 1 and 2. Is the game fair? Why or why not? If not, who has the better chance of winning? Take turns spinning the spinner. If you spin an odd number, Player 1 wins. If you spin an even number, Player 2 wins. ACTIVITY: Is This Game Fair? 3 4. IN YOUR OWN WORDS How can you describe the likelihood of an event? 5. Describe the likelihood of spinning an 8 in Activity 1. 6. Describe a career in which it is important to know the likelihood of an event. Use what you learned about the likelihood of an event to complete Exercises 4 and 5 on page 410. a. b. . Use Prior Results How can you use the results of the previous activities to determine whether the game is fair? Math Practice

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408 Chapter 10 Probability and Statistics Lesson 10.2 Lesson Tutorials Key Vocabulary probability, p. 408 EXAMPLE Describing the Likelihood of an Event 1 There is an 80% chance of thunderstorms tomorrow. Describe the likelihood of the event. The probability of thunderstorms tomorrow is 80%. Because 80% is close to 75%, it is likely that there will be thunderstorms tomorrow.
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