73% of all Americans live in cities with population greater than 100,000 people. If 30 Americans are randomly selected, find the probability that a. Exactly 20 of them live in cities with population greater than 100,000 people. ________ b. At most 22 of them live in cities with population greater than 100,000 people. _______ c. At least 22 of them live in cities with population greater than 100,000 people. ______