A quality analyst wants to construct a sample mean chart for controlling a packaging process. She knows from past experience that whenever this process is under control, package weight is normally distributed with a mean of 20 ounces and a standard deviation of 2 ounces. Each day last week, Mon thru Fri, she randomly selected four packages and weighed each as shown below. If she uses upper and lower control limits of 22 and 18 ounces, on what day(s), if any, does this process appear out of control? Day Weights (ounces) Mon 23 22 23 24 Tues 23 21 19 21 Wed 20 19 20 21 Thur 18 19 20 19 Fri 18 20 22 20 a. Monday b. Tuesday C. Monday and Tuesday d. Monday, Tuesday and Thursday e. None