Clerks at Mosier Data Systems key in thousands of insurance records each day for a variety of client firms. CEO Donna Mosier wants to set control limits using 3 Sigma. Sample of the work of 20 clerks are gathered (and shown in the table). Mosier carefully examine 100 records entered by each clerk and counts the number of errors. Which control chart is used? Plot control chart. Should Mosier Data Systems concern? 20 Sample # 2 5 6 7 9 10 11 12 13 14 15 16 17 18 19 Total errors: Number 2 5 3 3 2 6 7 5 4 11 3 0 4 80 of errors 6 5