The candy produced by a company has a sugar level that is normally distributed with a mean of 16.1 grams and a standard deviation of 0.9 grams. The company takes readings of every 10th bar off the production line. The reading points are 17.3, 14.9, 18.3, 16.5, 16.1, 17.4, 19.4. Is the process in control or out of control and why? Use a control chart to answer the question.
It is out of control as the values jump above and below the mean
It is out of control as one of these data points is more than 3 standard deviations from the mean
It is out of control as two of these data points are more than 2 standard deviations from the mean
It is out of control as at least two of three consecutive data points are more than 2 standard deviations from the mean