Question: Upper and Lower Control Limits? Five data entry operators work at the data processing department of the Birmingham Bank. Each day for 30 days, the

Upper and Lower Control Limits?

Five data entry operators work at the data processing department of the Birmingham Bank. Each day for 30 days, the number of defective records in a sample of 300 records typed by these operators has been noted, as follows: Sample No. No. Defectives No. Defectives Sample No. No. Defectives 1 8 5 4 5 2 3 4 18 10 10 7 Sample No. 11 12 13 14 15 16 17 18 21 22 23 24 25 26 27 28 17 5 12 9 11 3 17 12 7 7 14 10 14 6 5 6 7 8 13 10 7 9 19 29 19 20 12 2 10 13 17 30 a) Establish 30 upper and lower control limits

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