A manufacturing process is monitored with a control chart by observing the average of the thickness of four products randomly selected every two hours within 2.2-sigma control limits. This process is...

Extracted text: A manufacturing process is monitored with a control chart by observing the average of the thickness of four products randomly selected every two hours within 2.2-sigma control limits. This process is normally distributed with a mean thickness value of 166 mm and a standard deviation of 21 mm. What is the average run length of the control chart when the process is in control? Choose. What is the time interval in hours between two successive false alarms given by the control chart? Choose. What is the lower control limit of the control chart used to monitor the process? Choose