7. The performance of the first shift is reflected in the inspection results of electric carving knives. Determine the trial central line and control limits for each subgroup. Assume that any out-of-control points have assignable causes and determine the standard value for the fraction nonconforming for the next production period.

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Date Number Inspected Number Nonconforming Date Number Inspected Number Nonconforming Sept. 6 500 7 550 8 700 9 625 10 700 66897 5 Sept. 23 525 10 24 650 3 27 675 8 28 450 29 500 13 550 8 30 375 14 450 16 15 600 16 475 17 650 20 650 21 550 22 525 6696987 Oct. 1 550 4 600 5 700 6 660 7 450 8 500 11 525 3238749861