The following two questions involve a service process that has a mean of 130 seconds with a standard deviation of 2.5 seconds, where the upper and lower specification limits for the process are 140 seconds and 128 seconds, respectively. 3. What is the process capability ratio for this process? The process capability ratio (PCR) for this process is (USL - LSL) / (6 x standard deviation) = (140 - 128) / (6 x 2.5) = 1.6. Therefore, the answer is e) none of these, as none of the options provided matches the calculated PCR of 1.6. can you check answer fro this question? I get .80