Ch 11 – Probability & Statistics

1. Ch 11 – Probability & Statistics 11.3 – Independent and Dependent Events

2. Events are independent events if the occurrence of one event does not affect the probability of the other. Probability of Independent Events If A and B are independent events, then

3. A six-sided number cube is labeled with the numbers 1, 2, 2, 3, 3, and 3. Four sides are colored red, one side is white, and one side is yellow. Find each probability. • Tossing 2, then 2 B. Tossing red, then white, then yellow

4. Events are dependent events if the occurrence of one event affect the probability of the other. To find the probability of dependent events, you can use conditional probabilityP(B|A), the probability of event B, given that event A has already occurred. Probability of Dependent Events If A and B are dependent events, then

5. Two number cubes are rolled—one blue and one yellow. Explain why the events are dependent. Then find the indicated probability. • The blue cube shows a 6 and the sum is greater than 9. • The yellow cube shows an even number and the sum is 5.

6. The table shows domestic migration from 1995 to 2000. A person is randomly selected. Find each probability. • That an emigrant is from the West • That someone selected from the South is an immigrant • That someone selected is an emigrant and is from the Midwest

7. What do you know about face cards? • 52 Cards Total • 2 Colors • Red 26 cards • Black 26 cards • 4 Suits • Hearts ♥ Red 13 cards • Diamonds ♦ Red 13 cards • Clubs ♣ Black 13 cards • Spades ♠ Black 13 cards • 4 cards of each Number • Ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen, King

8. Replacement? • Two cards are drawn from a deck of 52. Determine whether the events are independent or dependent. Find the probability. • Selecting two hearts when the first card is replaced • Selecting two hearts when the first card is not replaced • A queen is drawn, is not replaced, and then a king is drawn