Suppose that 20% of all individuals have an adverse reaction to a particular drug. a medical researcher will administer the drug to one individual after another until the kth adverse reaction occurs, at which point the experiment will terminate.
a) k=1 What is the probability that when the experiment terminates, four individual have not had adverse reactions?
b) k=1 what is the probability that the drug is administered to exactly 6 individuals.
c) k=5 what is the probability that fewer than 9 individuals have not had adverse reactions when the experiment terminates?
d) k=7 How many individuals would you expect the drug to haven administered to?