6. Inspection results of video-of-the-month shipments to customers for 25 consecutive days are given in the following table. What central line and control limits should be established and posted if it is assumed that any outof-

control points have assignable causes? The number of inspections each day is constant and equals 1750.

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Date Number Nonconforming Date Number Nonconforming July 6 6789 47 July 23 37 42 26 39 48 27 51 58 28 44 12 32 29 61 13 38 30 48 14 53 Aug. 2 56 15 68 3 48 16 45 4 40 19 37 5 47 20 57 21 38 69 25 35 22 53