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Problem # l 1 ms}. In a Gallup Survey, 80% of the people interviewed were unaware that maintaining a healthy weight could reduce the risk of stroke. If 15 people are selected at random, nd the probability that a) exactly 13 are unaware that maintaining a healthy weight could reduce the risk of stroke. b) at least 13 are unaware that maintaining a healthy weight could reduce the risk of stroke. c) fewer than 12 are unaware that maintaining a healthy weight could reduce the risk of stroke. Problem 2 j pix]. Listed below are amounts of coffee (in ounces) randomly selected from different vending machines made by the Newton Machine Company. Use the sample results to construct a 95% condence interval for the mean amoimt of coffee in all dispensed cups. 11.5 10.3 9.7 13.0 11.5 11.1 13.2 11.1 11.1 12.6