The Eco Pulse survey from the marketing communications firm Shelton Group asked individuals to indicate things they do that makes them feel guilty. Based on the survey results, there is a .39 probability that a randomly selected person will feel guilty about wasting food and a .27 probability that a randomly selected person will feel guilty about leaving lights on when not in a room. Moreover, there is a .12 probability that a randomly selected person will feel guilty for both of these reasons.

a. What is the probability that a randomly selected person will feel guilty for either wasting food or leaving lights on when not in a room?

b. What is the probability that a randomly selected person will not feel guilty for either of these reasons?