Not using excel please

56.18 Five data entry operators work at the data processing department of the Royal Bank. Each day for 30 days, the number of defective records in a sample of 250 records typed by these opera- tors has been noted, as follows: No. Sample No. Sample No. 1 2 Defective 7 Sample No. 11 12 13 No. Defective 18 5 21 No. Defective 17 12 in 5 3 3 19 16 6 4 10 14 4 11 5 11 15 22 23 24 25 26 27 28 7 13 10 4 6 8 16 12 7 8 17 18 8 12 4 9 6 6 19 6 12 9 10 29 30 13 20 16 3 a) Establish 3o upper and lower control limits. b) Why can the lower control limit not be a negative number? c) The industry standards for the upper and lower control limits are 0.10 and 0.01, respectively. What does this imply about Royal Bank's own standards? BX