Bottles for room spray are supposed to weigh exactly 16 oz. Inspectors want to develop process control charts. They take eight boxes of five bottles each and weigh them. They obtain the following data. The mean weights of each of the 08 samples are 15.2, 14.6,16.5,18.1,13.2,16,15.9, and 14.8 respectively. Likewise, the range values for the each of 08 samples are 1.8, 0.7, 0.5, 0.4, 0.2, 0.4, 0.5, and 0.9 respectively. Find out Grand Mean (X double bar), and mean range (R bar). Round-up to THREE decimals Select one: a.-16.538, 0.865 b.-15.538, 0.675 c. 15.538,-0.675 d. 0,0 e. 15.538, 0.675