31% adults favor the use of unmanned drones by police agencies. Twelve U.S. adults are randomly selected. Find the probability that the number of U.S. adults who favor the use of unmanned drones by police agencies is (a) exactly three, (b) at least four, (c) less than eight. (a) P(3) = (Round to three decimal places as needed.) (b) P(x4) = (Round to three decimal places as needed.) (c) P(x < 8) = (Round to three decimal places as needed.)