The Perfect Circle company manufactures rings. Every hour 125 samples of finished rings are taken; each ring is tested by a technician. Which does not meet the criteria will be classified as defective; and the rest according to standard. The data can be seen from the table, 10 consecutive sampling times, taken for 1 week. Sample no. 1 2 3 4 5 6 7 8 9 10 Defective 15 13 16 11 13 14 20 25 30 45 What type of control chart should be used in this case? Draw the control chart based on the data provided. Is the system statistically controlled? What should a QC engineer do