uppose x has a distribution with a mean of 20 and a standard deviation of 3. Random samples of size / = 36 are drawn. (a) Describe the x distribution. O x has a binomial distribution. O x has a geometric distribution. O x has an unknown distribution. O x has an approximately normal distribution. x has a normal distribution. O x has a Poisson distribution, Compute the mean and standard deviation of the distribution. (For each answer, enter a number.) (b) Find the z value corresponding to x - 19. (Enter an exact number.) (c) Find P(x