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Question: Satisfaction with colleges. The National Center for Public Policy and Higher Education asked randomly chosen adults, "Are the colleges in your state doing an excellent, good, fair, or poor job, or don't you know enough to say?" Assume that the results of the poll accurately reflect the opinions of all adults. Here is the distribution of opinions:
Opinion: Excellent Good Fair Poor Don't know
Probability: 0.15 0.42 0.13 0.03 ?
(a) What is the probability that a randomly chosen adult doesn't know enough to say?
(b) What is the probability that a randomly chosen adult thinks that colleges are doing a good or excellent job?
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