Question 7 Daily inspection of piston manufactured in Company XYZ gives the following inspection results tabulated below. Sample 1 No Inspected Number of Defective 620 26 2 620 23 3 620 29 4 620 23 5 620 25 6 620 18 7 620 20 8 620 18 9 620 20 10 620 25 11 620 46 12 620 23 a) b) Determine the mean proportion defective and sample size. Determine the UCL and LCL for the p control chart. c) Determine the UCL and LCL for the np control chart. d) For the np control chart, identify any plot that is outside the control limits. e) Is there any plot outside the control chart of p and np chart? If yes, describe your follow up action. (20 marks)