Please answer Q6 a. and Q7. Please explain what formulas you are using.

Thank you.

Q6. One way in which a paper mill measures performance is the number of web breaks, a major disruption that occurs when the ow of paper (the "web") is broken, due either to a flaw in the fiber or to unusual tension. Web breaks are a fact of mill life, and most mill managers monitor. their occurrence. A mill with four production lines has collected the following data over the last few weeks. Being a fairly capital-intensive operation, the mill runs all four lines seven days a week for three shifts per day. a. Q7. Is the system under control now or what is the UCL and LCL (assume z=3 )