Suppose that the standard deviation of the waiting time process distribution is 0.1 minutes. If customer service wants to answer all calls within 4.5 ± 0.4 minutes, what are the upper and lower specification limits? The process is known to operate at a mean of 4.5 minutes What are the Cp and Cpk for this process? About what percentage of all units of the product will meet specifications? If each nonconforming customer service costs the customer service centre $5, and the annual service volume is 500,000 customers, what is the annual total cost of nonconforming customer services? Is the process capable of delivering a six-sigma service quality? If not, what should the standard deviation of the process be to meet sigma six quality?