A silk screening company prints 6000 decals per month. A random sample of 150 decals is taken every week and inspected based in four characteristics. The data for the last four weeks are summarized in the table below. Assuming the data in the table are representative of the process, what is the DPMO and process sigma level for the silk screening process?
Decal Characteristics Number of defects observed
Color Accuracy 10
Image Alignment 7
Color Consistency 8
Image sharpness 3