Rinker audio products has had recurring problems in its product quality. the company's manufacturing vice president suggests that rinker use a statistically based methodology that aims to reduce defects, boost productivity, eliminate waste, and cut costs throughout the company and whose ultimate goal would be to have just 3.4 defects per million units that rinker produces. what is the methodology that the manufacturing vice president is considering? mass customization lean manufacturing iso 9000 just-in-time inventory six sigma