5. Control charts for X and R are kept on the weight in kilograms of a color pigment for a batch process. After 25 subgroups with a subgroup size of 4, gX = 52.08 kg

(114.8 lb), g R = 11.82 kg (26.1 lb). Assuming the process is in a state of control, compute the X and R chart central line and control limits for the next production period.