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a. And the probability is 0.
b. Round to four decimal places as needed. Find the probability that exactly one of the selected adults says "no".
c. Round to four decimal places as needed. Find the probability that the 2nd adult says they were too young.
d. If we randomly select ten adults, the probability that at least one says "yes" is significantly 0.5, because the probability that all ten say "no" is 0.