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A study found that for 60% of the couples who have been married 10 years or less, both spouses work. A sample of 30 couples who have been married 10 years or less are selected from marital records available at a local courthouse. We are interested in the number of couples in this sample in which both spouses work. What is the probability that this number is:

(a) 20 or more?
(b) 25 or more?
(c) 10 or fewer?

(Use the normal approximation.)

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Statistics and Probability, Statistics

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