Cartons of Plaster of Paris are supposed to weigh exactly 32 oz. Inspectors want to develop process control charts. They take ten samples of six boxes each and weigh them. Based on the following data, compute the lower and upper control limits and determine whether the process is in control. Sample Mean Range 1 33.8 1.1 N 2 34.6 10.3 34.7 10.4 4 34.1 10.7 un 5 34.2 10.3 |34.3 10.4 33.9 10.5 CO 8 34.1 0.8 ON 34.2 10.4 10 34.4 0.3 The sample size is the upper control limit for the x-bar chart is (keep only two digits after the decimal for all answers after, such as 5.67), lower control limit for x-bar chart is , the upper control limit for R-chart is , and the central line for R-chart is