Discrete Probability Distributions

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Chapter 6 Discrete Probability Distributions 40. From recent experience, 5 percent of the computer keyboards produced by an automatic, high-speed machine are defective. What is the probability that out of six keyboards selected at random, exactly zero keyboards will be defective? A) 0.001 B) 0.167 C) 0.735 D) 0.500 Answer: C 41. The probabilities and the number of automobiles lined up at a Lakeside Olds at opening time (7:30 a.m.) for service are: Number 1 2 3 4 Probability 0.05 0.30 0.40 0.25 On a typical day, how many automobiles should Lakeside Olds expect to be lined up at opening? A) 10.00 B) 1.00 C) 2.85 D) 1.96 Answer: C 42. On a very hot summer day, 5 percent of the production employees at Midland States Steel are absent from work. The production employees are randomly selected for a special in-depth study on absenteeism. What is the probability of randomly selecting 10 production employees on a hot summer day and finding that none of them are absent? A) 0.002 B) 0.344 C) 0.599 D) 0.100 Answer: C 44. An insurance agent has appointments with four prospective clients tomorrow. From past experience the agent knows that the probability of making a sale on any appointment is 1 out of 5. Using the rules of probability, what is the likelihood that the agent will sell a policy to 3 of the 4 prospective clients? A) 0.250 B) 0.500 C) 0.410 D) 0.026 Answer: D Statistical Techniques in Business & Economics, Lind/Marchal/Wathen, 13/e 87 57. In a large metropolitan area, past records revealed that 30 percent of all the high school graduates go to college. From 20 graduates selected at random, what is the probability that exactly 8 will go to college? A) 0.114 B) 0.887 C) 0.400 D) 0.231 Answer: A 58. Chances are 50-50 that a newborn baby will be a girl. For families with five children, what is the probability that all the children are girls? A)

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