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Probability of randomly chosen adult regarding job

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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?

Reference no: EM131639574

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