15% of all Americans live in poverty. If 42 Americans are randomly selected, find the probability that a. Exactly 4 of them live in poverty. C] b. At most 8 of them live in poverty. C] c. At least 6 of them live in poverty. C] d. Between 7 and 12 (including 7 and 12) of them live in poverty. C] Round each answer to 4 decimal places