Question 1 - Kolzak Appliance Outlet just received a shipment of 15 TV sets. Shortly after they were received, the manufacturer called to report that he had inadvertently shipped 5 defective sets. Ms. Kolzak, the owner of the outlet, decided to test 4 of the 15 sets she received. What is the probability that none of the four sets tested is defective?

Question 2 - A researcher knows that in a given neighborhood, 45% of the households have incomes over $100,000. What is the probability that in a random sample of 10 households from that neighbourhood: (a) exactly 5 households will have incomes over $100,000? (b) 3 or fewer households will have incomes over $100,000? (c) more than 6 households will have incomes over $100,000?

Question 3 (Poisson Distribution) - A public health department studying the occurrence of brain cancer divides a city into 200 precincts of relatively equal size. The average occurrence of brain cancer is found to be 1.3 cases per precinct. How many precincts would be expected? to have: (a) 1 case of brain cancer? (b) 3 or more cases of brain cancer?