According to an AdweekJ Harris (July 2011) poll of U.S. adults, about 45% work during their summer vacation. Assume that the true proportion of all U.S. adults that work during summer vacation is p = .45. Now consider a random sample of 500 U.S. adults.
a. What is the probability that between 40% and 50% of the sampled adults work during summer vacation?
b. What is the probability that over 60% of the sampled adults work during summer vacation?