20) [4 pts] The weights of ice cream cartons are normally distributed with a mean weight of 12 ounces and a standard deviation of 0.7 ounce. a) (What is the probability that a randomly selected carton has a weight greater than 12.21 ounces? The probability is (Round to four decimal places as needed.) b) A sample of 25 cartons is randomly selected. What is the probability that their mean weight is greater than 12.21 ounces? The probability is (Round to four decimal places as needed.)