A textile manufacturer inspects each bolt of material at the end of the manufacturing process. When the process is in control, it averages 36 defects per bolt. If a 2-sigma control limit is used, what is the upper control limit? Less than or equal to 30 More than 30 but less than or equal to 40 More than 40 but less than or equal to 50 More than 50 but less than or equal to 60 More than 60.