An archer hits his target 80% of the time. If he shoots seven arrows, what is the probability of each event? (a) He never hits the target. (b) He hits the target every time. (c) He hits the target more than once. (d) He hits the target at least five times. Rabies Health authorities estimate that 10% of the raccoons in a certain rural county are carriers of rabies. A dog is bitten by four different raccoons in this county. What is the probability that he was bitten by at least one rabies carrier