Gallup conducted a survey and reported that 42% of Americans approve of the President's job thus far. Suppose that 8 Americans are randomly selected. Round answers to 3 decimal places. a) Find the probability that of the the 8 Americans, 6 of them disapprove of the President's job. b) Find the probability that 4 or less Americans approve of the President's job. c) Find the mean of the probability distribution. d) Find the standard deviation of the probability distribution