4. As the Operations Manager you are observing the wheat bags coming off the production line. Using the following information below, you are trying to determine if your mean chart limit to see if you are in control. Unfortunately, you do not have access to the process standard deviation, but you know you want to calculate the control chart to 3 sigma. Using the following information: Overall Process average is 180kg for the wheat bag. The average range of the process is 2kg The Sample size used per observation is six a) Determine the UCL of control mean (3 marks) b) Determine the LCL of control mean (2 marks) c) Determine the UCL of range control limits (3 marks) d) Determine the LCL of range control limits (2 marks)