1. The sample grand mean (based on 45 samples of seven observations each) for the weight of a can of beans is 250 grams with an average range of 8 grams. Find the upper and lower control limits for the x – and R -charts. 2. If 40 samples of 200 items are tested for nonconformity, and 240 of the 8000 items are defective, find the upper and lower control limits for a p -chart.