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Click the mouse button or press the Space Bar to display the answers. Objective Find the probability of a simple event Vocabulary Outcome One possible result of a probability event Vocabulary Simple event One outcome or a collection of outcomes Vocabulary Probability The chance that some event will happen. A ratio Ways an event can occur Number of Possible Outcomes Vocabulary Random Outcomes occur at random if each outcome is equally likely to occur Vocabulary Complementary event The events of one outcome happening and that outcome not happening are complementary events. The sum of the probabilities of complementary events is 1 Example 1 Find Probability Example 2 Find Probability Example 3 Find a Complementary Event If the spinner is spun once, what is the probability of it landing on an odd number number? Write probability statement Numerator is “odd numbers possible” Denominator is “total numbers possible” 1/3 If the spinner is spun once, what is the probability of it landing on an odd number? Count how many “odd numbers” 1 and 3 are odd numbers Place 2 in the numerator 1/3 If the spinner is spun once, what is the probability of it landing on an odd number? Count how many “total numbers” are on the spinner There are 4 numbers on the spinner Place 4 in the denominator 1/3 If the spinner is spun once, what is the probability of it landing on an odd number? 2 2 Answer: Find the GCF = 2 Divide GCF into numerator and denominator 1/3 What is the probability of rolling a number less than three on a number cube marked with 1, 2, 3, 4, 5, and 6 on its faces? NOTE: A number cube is a number dice Answer: P (number less than 3) = 1/3 The bookstore at the mall has 15 math books, 20 science books, 10 literature books and 5 history books for a give-away promotion. The clerk will select a book at random to give to each customer. What is the probability that the clerk will select a literature book? book P (literature book) = number of literature books total number of books Write probability statement Numerator will be “number of literature books” Denominator will be “total number of books” 2/3 The bookstore at the mall has 15 math books, 20 science books, 10 literature books and 5 history books for a give-away promotion. The clerk will select a book at random to give to each customer. What is the probability that the clerk will select a literature book? book P (literature book) = number of literature books total number of books P (literature book) = 10 50 Replace literature books with 10 Count total number of books 15 + 20 + 10 + 5 = 50 2/3 The bookstore at the mall has 15 math books, 20 science books, 10 literature books and 5 history books for a give-away promotion. The clerk will select a book at random to give to each customer. What is the probability that the clerk will select a literature book? book P (literature book) = number of literature books total number of books P (literature book) = 10 10 50 10 Answer: 1 P (literature book) = 5 Find the GCF = 10 Divide GCF into numerator and denominator 2/3 GAMES A game requires rolling a number cube marked with 1, 2, 3, 4, 5, and 6 on its. If the roll is four or less, the player wins. What is the probability of winning the game? Answer: P (4 or less) = 2 3 2/3 GAMES A game requires spinning the spinner. If the spin is 6 or greater, the player wins. What is the probability of not winning the game? P (5 or less) = Write probability statement To win, must have 6 or greater So to lose, must have 5 or less 3/3 GAMES A game requires spinning the spinner. If the spin is 6 or greater, the player wins. What is the probability of not winning the game? numbers 5 or less P (5 or less) = total number of numbers Numerator is “numbers 5 or less” Denominator is “total number of numbers” 3/3 GAMES A game requires spinning the spinner. If the spin is 6 or greater, the player wins. What is the probability of not winning the game? numbers 5 or less P (5 or less) = total number of numbers P (5 or less) = 5 8 Count numbers that are 5 or less Count all the numbers 3/3 GAMES A game requires spinning the spinner. If the spin is 6 or greater, the player wins. What is the probability of not winning the game? numbers 5 or less P (5 or less) = total number of numbers Answer: 5 P (5 or less) = 8 Find the GCF = 1 NOTE: This is a complementary event 3/3 * GAMES A game requires rolling a number cube marked with 1, 2, 3, 4, 5, and 6 on its faces. If the roll is two or less, the player wins. What is the probability of not winning the game? Answer: P (not winning) = 2 3 NOTE: This is a complementary event 3/3 Assignment Lesson 9:1 Simple Events 10 - 26 All