The Northside Rifle team has two markspersons, Dick and Sally. Dick hits a bull's-eye 90% of the time, and Sally hits a bull's-eye 95% of the time.
(a) what is the probability that either Dick or Sally or both will hit the bull's-eye if each takes one shot?
(b) What is the probability that Dick and Sally will both hit the bull's-eye?
(c) Did you make any assumptions in answering the preceding questions? If you answered yes, do you think that you are justified in making the assumption(s)?