Consider two populations for which H₁ = 32, 0₁ = 2, H₂= 27, and 0₂= 3. Suppose that two independent random samples of sizes n. 48 and n₂ = 57 are selected. Describe the approximate sampling distribution of x₁-x₂ (center, variability, and shape). What is the shape of the distribution? a. The distribution would be non-normal. b. The distribution is approximately normal. c. The shape cannot be determined. What is the mean of the distribution? (letter only) What is the standard deviation of the distribution? (Round your answer to three decimal places.)