23 Jan Exam: 250712RR – Probability
Exam: 250712RR – Probability
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Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.
1. For each car entering the drive-through of a fast-food restaurant, x = the number of occupants. In this study, x is a
A. continuous quantitative variable.
B. joint probability.
C. dependent event.
D. discrete random variable.
2. If the mean number of hours of television watched by teenagers per week is 12 with a standard deviation of 2 hours, what proportion of teenagers watch 16 to 18 hours of TV a week? (Assume a normal distribution.)
A. 4.2%
B. 2.1%
C. 4.5%
D. 0.3%
Protestant Catholic Jewish Other
Democrat 0.35 0.10 0.03 0.02
Republican 0.27 0.09 0.02 0.01
Independent 0.05 0.03 0.02 0.01
3. The table above gives the probabilities of combinations of religion and political parties in a city in the United States. What is the probability that a randomly selected person will be a Protestant and at the same time be a Democrat or a Republican?
A. 0.67
B. 0.62
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