1. Auto pistons at Kevin's plant in Pueblo are produced in a forging process, and the diameter is a critical factor that must be controlled. From sample size of 6 pistons produced each day, the mean and the range of this diameter have been as follows: *round your answers to three decimal places. 1) What is the value of X-double bar (mean of sample means)? 2) What is the value of ? 3) What are the UCL and LCL of X-bar chart? UCL: , LCL: 4) What are the UCL and LCL of R chart? UCL: , LCL