Babies: According to a recent report, a sample of 240 onevearold baby boys in the United States had a mean weight of 25.5 pounds. Assume the population standard deviation is o = 5.1 pounds. (a) Construct an 80% condence interval for the mean weight of all oneyearold baby boys in the United States. Round the answer to at least one decimal place. An 80% condence interval for the mean weight in pounds of all oneyearold baby boys in the United States is B