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Unformatted text preview: Some Important Discrete Probability Distributions 123 CHAPTER 5: SOME IMPORTANT DISCRETE PROBABILITY DISTRIBUTIONS 1. Thirty-six of the staff of 80 teachers at a local intermediate school are certified in Cardio- Pulmonary Resuscitation (CPR). In 180 days of school, about how many days can we expect that the teacher on bus duty will likely be certified in CPR? a) 5 days b) 45 days c) 65 days d) 81 days ANSWER: d TYPE: MC DIFFICULTY: Moderate KEYWORDS: binomial distribution, mean 2. A campus program evenly enrolls undergraduate and graduate students. If a random sample of 4 students is selected from the program to be interviewed about the introduction of a new fast food outlet on the ground floor of the campus building, what is the probability that all 4 students selected are undergraduate students? a) 0.0256 b) 0.0625 c) 0.16 d) 1.00 ANSWER: b TYPE: MC DIFFICULTY: Difficult KEYWORDS: binomial distribution 3. A probability distribution is an equation that a) associates a particular probability of occurrence with each outcome in the sample space. b) measures outcomes and assigns values of X to the simple events. c) assigns a value to the variability in the sample space. d) assigns a value to the center of the sample space. ANSWER: a TYPE: MC DIFFICULTY: Moderate KEYWORDS: probability distribution 4. The connotation &quot;expected value&quot; or &quot;expected gain&quot; from playing roulette at a casino means a) the amount you expect to &quot;gain&quot; on a single play. b) the amount you expect to &quot;gain&quot; in the long run over many plays. c) the amount you need to &quot;break even&quot; over many plays. d) the amount you should expect to gain if you are lucky. ANSWER: b 124 Some Important Discrete Probability Distributions TYPE: MC DIFFICULTY: Easy KEYWORDS: expected value 5. Which of the following about the binomial distribution is not a true statement? a) The probability of success must be constant from trial to trial. b) Each outcome is independent of the other. c) Each outcome may be classified as either &quot;success&quot; or &quot;failure.&quot; d) The random variable of interest is continuous. ANSWER: d TYPE: MC DIFFICULTY: Easy KEYWORDS: binomial distribution, properties 6. In a binomial distribution a) the random variable X is continuous. b) the probability of success p is stable from trial to trial. c) the number of trials n must be at least 30. d) the results of one trial are dependent on the results of the other trials. ANSWER: b TYPE: MC DIFFICULTY: Easy KEYWORDS: binomial distribution, properties 7. Whenever p = 0.5, the binomial distribution will a) always be symmetric. b) be symmetric only if n is large. c) be right-skewed. d) be left-skewed. ANSWER: a TYPE: MC DIFFICULTY: Moderate KEYWORDS: binomial distribution, properties 8. Whenever p = 0.1 and n is small, the binomial distribution will be a) symmetric....
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- Fall '07
- Normal Distribution, Probability theory, Binomial distribution, Discrete probability distribution