Working on summer Vacation. According to a Harris Interactive (July 2013) poll of U.S. adults, about 60% work during their summer vacation. (See Exercise 3.13, p. 145.) Assume that the true proportion of all US. adults who work during summer vacation is p .6. Now consider a random sample of 500 U.S. adults. a. What is the probability that between 55% and 65% of the sampled adults work during summer vacation? b. What is the probability that over 75% of the sampled adults work during summer vacation?

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