Managing for Quality and Performance Excellence 10th Edition by James Evans ,William Lindsay

Exercise 40

Note: Data for many of the problems in this chapter can be found in the Excel workbook C08Data.xlsx on the Student Companion Site. Click on the appropriate worksheet tab as noted in the problem (e.g., Prob. 8-6, etc.) to access the data.
Leatherlike Manufacturing Company makes an artificial leather-like product for the fashion accessory market. The material is made in sheets and has the appearance of a thin rug. Each sheet is 36 inches wide and 100 feet long and is wound into a roll. The quality manager has requested that 200 rolls be inspected. Thirty-eight nonconformances were found.
a. Calculate the nonconformances per unit (NPU) and the throughput yield (TY).
b. If the production process consists of three steps, with step 1 having a TY of 94 percent; step 2, 90 percent; and step 3, 92 percent, what is the rolled throughput yield (RTY), and the proportion nonconforming?