For each of the following situations, nd an interval that contains (approximately or exactly) 9933 percent of all the possible sample means. In which cases must we assume that the population is normallyI distributed? Why? {a} pr =10, U = 2, n = 25. {Round your answers to 2 decimal places.) {h} ,u = 500. a = .5. n = 100. {Round your answers to 2 decimal places.) II {cl ,u = 3. a = .'F, n = 4. {Round your answers to 2 decimal places.) {d} ,u = 100, o = 1. n = 1,600. (Round your answers to 3 decimal places.)