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 "nontasters." Suppo that 20 Americans are randomly chosen and are tested for PTC. (Round your answers to three decimal places.) LUSE SALT (a) What is the probability that 16 or more are "tasters"? (b) What is the probability that 12 or fewer are "tasters"?

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