23. Determine the trial control limits and revised control limits for a u chart using the data in the table for the surface finish of rolls of white paper. Assume any outof-

control points have assignable causes.

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Lot Number Sample Size Total Nonconformities Lot Number Sample Size Total Nonconformities 123 10 45 15 10 48 2 10 51 16 11 35 10 36 17 10 39 4 9 48 18 10 29 5 10 42 19 10 37 6 10 5 20 10 33 7 10 33 21 10 15 8 9 10 11 12 13 14 2222 8 27 22 10 33 8 31 23 11 27 8 22 24 10 23 12 25 25 10 25 12 35 26 10 41 12 32 27 9 37 10 43 28 10 28