Taste Test for PTC The taste test for PTC(phenylthiocarbamide) is a favorite exercise

Chapter 5, Problem 33

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Taste Test for PTC The taste test for PTC(phenylthiocarbamide) is a favorite exercise for everyhuman genetics class. It has been established that asingle gene determines the characteristic, and that70% of Americans are tasters, while 30% are nontasters.Suppose that 20 Americans are randomlychosen and are tested for PTC.a. What is the probability that 17 or more are tasters?b. What is the probability that 15 or fewer are tasters?

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