Describe a business process application and/or S4 / IEE project application of the normal probability plot that can improve the explanation and understanding of a process output; e.g., 80% of invoice...

Describe a business process application and/or S4 / IEE project application of the normal probability plot that can improve the explanation and understanding of a process output; e.g., 80% of invoice payments are between 5 and 120 days delinquent.

Consider that the 31 observations in Exercise 10.13 were a random sample from a population. Determine the estimated 80% frequency of occurrence range. Determine the estimated proportion below a lower specification limit of 120 and an upper specification limit of 150.