QUESTION 1 A researcher wants to examine the number of Maryland households that will buy a house within the next year. If three Maryland households are selected randomly, let X be the number of the households that intend to purchase a house within the next year. What are the values that the random variable can take on? 0, 1, 2 0, 1, 2, 3 1, 2, 3 0.25 points QUESTION 2 One of the requirements of a probability distribution is that the probabilities must sum to 0. True False 0.25 points QUESTION 3 The probability model below describes the number of thunderstorms that a certain town may experience during the month of August. What should the value be in the missing cell? 0.3 0.2 0.1 -0.2 0.25 points QUESTION 4 Consider the following probability distribution of the daily profit of a bakery. (Negative profit represents a loss.) On a given day, the probability the bakery will have a profit of $200 or more is 0.20 0.30 0.80 0.50 0.75 points QUESTION 5 Sue Anne owns a medium-sized business. The probability model below describes the number of employees that may call in sick on any given day. What is the mean number of employees calling in sick each day? 1 points QUESTION 6 Which of the following is NOT an assumption of the Binomial distribution? There are a fixed number of trials The probability of success is equal to 0.5 in all trials. The probability of a success, p, is constant There are two possible outcomes (success and failure) 0.25 points QUESTION 7 Is the binomial distribution appropiate for the following situation: Joe buys a ticket in his state’s “Pick 3” lottery game every week. Let X represent the number of times in a year that he wins a prize. Yes No Cannot determine from information given 0.25 points QUESTION 8 Five percent of the eyeglasses sold at an optical retailer have tinted lenses. Forty pairs of glasses are sold on a particular day and six have tinted lenses. Identify n, p, and x. n = p = x = 0.75 points QUESTION 9 Only 35% of the drivers in a particular city wear seat belts. Suppose that 20 drivers are stopped at random what is the probability that exactly four are wearing a seatbelt? (Round your answer to 4 decimal places) 1 points QUESTION 10 In a certain college, 33% of the physics majors belong to ethnic minorities. If 8 students are selected at random from the physics majors, what is the probability that more than 5 belong to an ethnic minority? 0.0659 0.0846 0.0187 0.9154 1 points QUESTION 11 The probability that a particular species of plant survives the winter is 0.6. Charlotte has 22 plants of this species. What is the mean number that will survive the winter? Round to 1 decimal place. 1 points QUESTION 12 Using the information from the previous problem, would it be unusual if 17 plants survived the winter? yes no cannot determine
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