et's say a cancer vaccine is effective 85% of the time, p = 0.85. If we randomly select 12 vaccinated people from the population, n = 12, and expose them to the virus that causes the cancer, what is the probability that the vaccine will work 1. for 4 people? 2. for 7 or less people? 3. for more than 7 random people? 4. for between 8 and 10 people