1) An intensive care unit medical lab has an average turnaround time of 26.2 minutes and a standard deviation of 1.05 minutes. The upper specification limit is 30 minutes, and the lower specification limit is 20 minutes. What is the process capability index for this lab? Round your answer to the nearest three decimal places. 2) You would like to develop variable control chart with three-sigma control limits. If your 10 samples each contain 20 observations, what value of D should you use for your R- Chart? 3.