pepsico. would like to monitor how much beverage they put into each 330 ml. bottle. to establish its x-chart and r-chart, the following observations are recorded. samples obs 1 obs 2 obs 3 1 314 311 317 2 315 312 316 3 313 315 316 4 316 320 318 factors for three-sigma control limits for mean and range charts number of observations in subgroup, n factor for mean chart, a2 lower control limit factor for range chart, d3 upper control limit factor for range chart, d4 2 1.88 0 3.27 3 1.02 0 2.57 4 0.73 0 2.28 5 0.58 0 2.11 6 0.48 0 2.00 7 0.42 0.08 1.92 8 0.37 0.14 1.86 9 0.34 0.18 1.82 10 0.31 0.22 1.78 calculate ucl for the mean chart. 319.58 322.67 316.45 317.78