Problem 1: The intensive care unit lab process has an average turnaround time of 26 minutes and a standard deviation of 1.25 minutes. The nominal value for this service is 25 minutes with an USL of 30 minutes and LSL of 20 minutes. a) Is the lab process capable of three sigma level of performance? b) Is the lab process capable of four sigma level of performance? c) is the lab process capable of six sigma level of performance