Suppose that 39% of all U.S. employees contribute to a retirement plan (p = 0.39).   (a) In a random sample of 100 employees, what is the approximate probability that at least half of those in the sample contribute to a retirement plan? (Round your answer to four decimal places.) _____?______   (b) Suppose you were told that at least 60 of the 100 employees in a sample from your state contribute to a retirement plan. Would you think p =

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