a. Give the mean and standard deviation of the (repeated) sampling distribution x. X O- = x (Type integers or decimals.) b. Describe the shape of the sampling distribution of x. Does this answer depend on the sample size? Choose the correct answer below. O A. The shape is that of a uniform distribution and does not depend on the sample size. O B. The shape is that of a normal distribution and does not depend on the sample size. O C. The shape is that of a uniform distribution and depends on the sample size. O D. The shape is that of a normal distribution and depends on the sample size.A random sample of n = 81 observations is drawn from a population with a mean equal to 15 and a standard deviation equal to 9. Complete parts a through 9 below. '...1