1.) If 3/4 of the nursing majors are female, find the probability that 3 out of 7 nursing majors are female. 2.) In a recent survey, 80% of the citizens in a community favored the building of a post office. If 15 citizens are selected, find the probability that 9 favor the building of a post office. 3.) A recent study found that 40% of all people over age of 62 wear hearing aids. If a random sample of 5 people over 62 is selected, find the probability of exactly two people wear hearing aids. (5 decimal places)