Lesson 9-1 Pages Simple Events Lesson Check Ch 8

What you will learn! How to find the probability of simple events.

Outcome Simple event Probability Random Complementary event

What you really need to know! The probability of an event is a ratio that compares the number of favorable outcomes to the number of possible outcomes. Outcomes occur at random if each outcome occurs by chance.

What you really need to know! Two events that are the only ones that can possibly happen are complementary events. The sum of the probabilities of complementary events is 1.

What you really need to know!

Example 1: If the spinner shown below is spun once, what is the probability of its landing on an odd number?

Example 2: A game requires spinning the spinner shown below twice. If the sum of the two spins is 6 or greater, the player wins. What is the probability of winning the game? 1, 1 2, 1 3, 1 4, 1 1, 2 2, 2 3, 2 4, 2 1, 3 2, 3 3, 3 4, 3 1, 4 2, 4 3, 4 4, 4 1, 1 2, 1 3, 1 4, 1 1, 2 2, 2 3, 2 4, 2 1, 3 2, 3 3, 3 4, 3 1, 4 2, 4 3, 4 4, 4

1, 1 2, 1 3, 1 4, 1 1, 2 2, 2 3, 2 4, 2 1, 3 2, 3 3, 3 4, 3 1, 4 2, 4 3, 4 4, 4

Example 3: A game requires spinning the spinner shown below twice. If the sum of the two spins is 6 or greater, the player wins. What is the probability of not winning the game? 1, 1 2, 1 3, 1 4, 1 1, 2 2, 2 3, 2 4, 2 1, 3 2, 3 3, 3 4, 3 1, 4 2, 4 3, 4 4, 4 1, 1 2, 1 3, 1 4, 1 1, 2 2, 2 3, 2 4, 2 1, 3 2, 3 3, 3 4, 3 1, 4 2, 4 3, 4 4, 4

1, 1 2, 1 3, 1 4, 1 1, 2 2, 2 3, 2 4, 2 1, 3 2, 3 3, 3 4, 3 1, 4 2, 4 3, 4 4, 4

Example 3: Method 2

Page 372 Guided Practice #’s 4-9

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Homework: Page #’s #’s Lesson Check 9-1

50 Total Kids

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Page 584 Lesson 9-1 Lesson Check 9-1