Computing the upper control limit and lower control limit on an SPC chart tells the operator if any “special cause” variation has entered the system. The average weight of the product is 8.42 pounds and the acceptable range is plus or minus .65 pounds. What are the correct upper and lower control limits?

Upper control limit = Average weight + 0.65 pounds

= 8.42 pounds + 0.65 pounds

= 9.07 pounds

Lower control limit = Average weight – 0.65 pounds

= 8.42 pounds – 0.65 pounds

= 7.77 pounds

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