Question: The taste test for PTC (phenylthiocarbamide) is a favorite exercise for every human genetics class. It has been established that a single gene determines the

The taste test for PTC (phenylthiocarbamide) is a favorite exercise for every human genetics class. It has been established that a single gene determines the characteristic, and that 70% of Americans are "tasters," while 30% are "non-tasters." Suppose that 20 Americans are randomly chosen 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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