1. Slide 4- 1 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Active Learning Lecture Slides For use with Classroom Response Systems Elementary Statistics: Picturing the World Fourth Edition by Larson and Farber Chapter 4: Discrete Probability Distributions

2. Slide 4- 2 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley True or false: The number of kittens in a litter is an example of a discrete random variable. A. True B. False

3. Slide 4- 3 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley True or false: The number of kittens in a litter is an example of a discrete random variable. A. True B. False

4. Slide 4- 4 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Determine the probability distribution’s missing probability value. A. 0.25 B. 0.65 C. 0.15 D. 0.35 x0123 P(x)P(x)0.250.30?0.10

5. Slide 4- 5 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Determine the probability distribution’s missing probability value. A. 0.25 B. 0.65 C. 0.15 D. 0.35 x0123 P(x)P(x)0.250.30?0.10

6. Slide 4- 6 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley x represents the number of televisions in a household: Find the mean. A. 2 B. 1.5 C. 6 D. 0.25 x0123 P(x)P(x)0.050.200.450.30

7. Slide 4- 7 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley x represents the number of televisions in a household: Find the mean. A. 2 B. 1.5 C. 6 D. 0.25 x0123 P(x)P(x)0.050.200.450.30

8. Slide 4- 8 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley x represents the number of televisions in a household: Find the standard deviation. A. 1.29 B. 0.837 C. 0.146 D. 1.12 x0123 P(x)P(x)0.050.200.450.30

9. Slide 4- 9 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley x represents the number of televisions in a household: Find the standard deviation. A. 1.29 B. 0.837 C. 0.146 D. 1.12 x0123 P(x)P(x)0.050.200.450.30

10. Slide 4- 10 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Forty-three percent of marriages end in divorce. You randomly select 15 married couples. Find the probability exactly 5 of the marriages will end in divorce. A. 0.160 B. 0.015 C. 0.039 D. 0.333

11. Slide 4- 11 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Forty-three percent of marriages end in divorce. You randomly select 15 married couples. Find the probability exactly 5 of the marriages will end in divorce. A. 0.160 B. 0.015 C. 0.039 D. 0.333

12. Slide 4- 12 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Forty-three percent of marriages end in divorce. You randomly select 15 married couples. Find the mean number of marriages that will end in divorce. A. 2.15 B. 8.55 C. 6.45 D. 2.85

13. Slide 4- 13 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Forty-three percent of marriages end in divorce. You randomly select 15 married couples. Find the mean number of marriages that will end in divorce. A. 2.15 B. 8.55 C. 6.45 D. 2.85

14. Slide 4- 14 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley A fair die is rolled until a 2 appears. Find the probability that the first 2 appears on the fifth roll of the die. A. 0.482 B. 0.067 C. 0.0006 D. 0.080

15. Slide 4- 15 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley A fair die is rolled until a 2 appears. Find the probability that the first 2 appears on the fifth roll of the die. A. 0.482 B. 0.067 C. 0.0006 D. 0.080

16. Slide 4- 16 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley The mean number of customers arriving at a bank during a 15-minute period is 10. Find the probability that exactly 8 customers will arrive at the bank during a 15-minute period. A. 0.0194 B. 0.1126 C. 0.0003 D. 0.0390

17. Slide 4- 17 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley The mean number of customers arriving at a bank during a 15-minute period is 10. Find the probability that exactly 8 customers will arrive at the bank during a 15-minute period. A. 0.0194 B. 0.1126 C. 0.0003 D. 0.0390