8. a) Use the following data to create a process control chart for the chair manufacturer, Singh Inc. (3) Week 1 1000 chairs are sampled each week Based on previous data, the average number of defects is 5% 2 3 Defects 55 35 55 40 60 4 5 or 50 chairs per sample Based on previous data, the standard deviation is 1.5% or 15 chairs per sample The company sets controls for the samples at plus or minus 6 7 8 9 35 50 55 65 55 65 70 two standard deviations 10 11 12 13 65 14 15 70 75 Defects 80 60 , Defects 40 20 0 b) Based on the process control chart you created, is the system in control? Explain. () (2)