Small boxes of NutraFlakes cereal are labeled "net weight 10 ounces." Each hour, a random sample of 6 boxes is weighed to check process control. Five hours of observations yielded the following sample information. Construct a 3-sigma R chart. What does the chart tell you? Hour 1 2 3 4 5 Sample mean (x-bar) 10.5 10.0 9.6 10.5 9.4 ∑x-bar =50.0 Sample range (R) 0.8 1.2 0.9 0.6 0.5 ∑R =4.0