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1: Chance Experiments

1: Chance Experiments. How likely it is that some events will occur? Suppose you and your friend will play a game using the spinner shown here:. Decide who will go first . Each person picks a color. Both players cannot pick the same color.

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1: Chance Experiments

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  1. 1: Chance Experiments How likely it is that some events will occur? Suppose you and your friend will play a game using the spinner shown here: • Decide who will go first. • Each person picks a color. Both players cannot pick the same color. • Each person takes a turn spinning the spinner and recording what color the spinner stops on. The winner is the person whose color is the first to happen times. • Play the game and remember to record the color the spinner stops on for each spin. Dr. Basta Grade 7, Module 5, Lesson 1

  2. How fair is this game? • Who do you think will win the game? • Will it make a difference who goes first? • Do you think this game is fair? Dr. Basta Grade 7, Module 5, Lesson 1

  3. What are the chances green will win? Which spinner gives green the best chances to win? Spinner B, because the green section is larger for this spinner than for the other spinners. Dr. Basta Grade 7, Module 5, Lesson 1

  4. What is Probability? A probability is represented by a number between and . It can be expressed in several ways: a fraction (don’t simplify), a decimal, or a percent. Dr. Basta Grade 7, Module 5, Lesson 1

  5. What are my chances? Some events are impossible. These events have a probability of . You have a bag with two green cubes, and you select one at random. What is the chance of selecting a blue cube? There is no way to select a blue cube if there are no blue cubes in the bag. Dr. Basta Grade 7, Module 5, Lesson 1

  6. What are my chances? Some events are certain. These events have a probability of . You have a bag with two green cubes, and you select one at random. What are the chances of selecting a green cube? You will always get a green cube if there are only green cubes in the bag. Dr. Basta Grade 7, Module 5, Lesson 1

  7. What are my chances? Some events are classified as equally likely to happen or to not happen. These events have a probability of . You have a bag with one blue cube and one red cube and you randomly pick one. What are the chances of selecting a blue cube? You will select a blue cube one-half of the time. Dr. Basta Grade 7, Module 5, Lesson 1

  8. What are my chances? Some events are less likely to happen than to not happen. These events will have a probability that is less than . These events could be described as “unlikely” to occur. If you have a bag that contains eight blue cubes and two red cubes, and you select one at random, it is unlikely that you will get a red cube. Even though it is not impossible to get a red cube, a red cube would not be selected very often because there are many more blue cubes than red cubes. Dr. Basta Grade 7, Module 5, Lesson 1

  9. What are my chances? Some events are more likely to happen than to not happen. These events will have a probability that is greater than . These events could be described as “likely” to occur. If you have a bag that contains eight blue cubes and two red cubes, and you select one at random, it is likely that you will get a blue cube. Even though it is not certain that you will get a blue cube, a blue cube would be selected most of the time because there are many more blue cubes than red cubes. Dr. Basta Grade 7, Module 5, Lesson 1

  10. Lesson Summary • Probabilityis a measure of how likely it is that an event will happen. • A probability is a number between and . • The probability scale is: Dr. Basta Grade 7, Module 5, Lesson 1

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