=15-11 Small boxes of NutraFlakes cereal are labeled “net weight 10 ounces.” Each hour, random samples of size n = 4 boxes are weighed to check process control. Five hours of observations yielded the following:

Weight Time Box 1 Box 2 Box 3 Box 4 9 a.m. 9.8 10.4 9.9 10.3 10 a.m. 10.1 10.2 9.9 9.8 11 a.m. 9.9 10.5 10.3 10.1 Noon 9.7 9.8 10.3 10.2 1 p.m. 9.7 10.1 9.9 9.9 Using these data, construct limits for x- and R-Charts. Is the process in control? What other steps should the QC department follow at this point?