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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

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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 200 records typed by these operators has been noted, as follows Sample Sample Sample 0 Defectives 18 13 Defectives Defectives 21 6 19 12 13 23 24 25 26 27 28 29 30 17 4 4 15 16 12 4 17 15 19 20 10

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