1. Compound Probability PSSA Unit

2. Single Events  A single event involves the use of ONE item such as: * one card being drawn * one coin being tossed * one die being rolled  Example: From a normal deck of 52 cards, what is the probability of choosing the queen of clubs?  The deck contains only one queen of clubs, so the probability will be 1/52.

3. Compound Events  A compound event involves the use of two or more items such as: * two cards being drawn * three coins being tossed * two dice being rolled  Example: Amy has 5 tank tops, 3 pairs of jeans, and 2 pairs of sneakers. How many different outfits consisting of one tank top, one pair of jeans, and one pair of sneakers are possible?

4. To find the probability of two or more events… If the problem asks for the probability of one event OR another, add the probabilities. If the problem asks for the probability of one event AND another, multiply the probabilities.

5. For Example: What is the probability of rolling a 3 or a 4 on a single die. What is the probability of rolling 2 dice and rolling a 3 on one and a 4 on the other.

6. Example You have two poker decks of cards. What is the probability of picking a queen or a king from a poker deck of cards?

7. Example If you pick 2 cards from two separate poker decks, what is the probability you pick a jack and a 9?

8. Example You have a bag of 20 marbles. 5 are blue, 4 are red, and 11 are yellow. What is the probability you pick a red marble? What is the probability you pick a yellow marble?

9. Example From the same bag of marbles, what is the probability you pick a red and a yellow.

10. Example Using the spinner on the next slide, what is the probability you spin an even number?

11. Example

12. Using the spinners on the next slide, what is the probability you spin a 3 on one and an even on the other?

13. Two Spinners

14. Example Using the same spinners, what is the probability you spin two 9’s?

15. Example What is the probability you flip a coin and get tails? What is the probability you flip 3 coins and get all tails?