Managing for Quality and Performance Excellence 9th Edition by James Evans,William Lindsay

Exercise 66

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.
PCDrives has a manufacturing process that is normally distributed and has the sample means and ranges for 15 samples of size 5, found in the worksheet Prob. 8-32 in the C08Data.xlsx file on the Student Companion Site for this chapter. Note that only sample statistics have been given, instead of the raw data from the samples. Determine process capability limits by estimating the standard deviation using formula (8.34). If specifications are determined to be 70 ± 25, what percentage will be out of specification?