solution

A sheet metal part is produced requiring two press-working operations. The third step is to weld it to the base. The fourth step is an assembly operation with the last station is an electroplating operation. The fraction defect rates for each station as as follows: q1 = .02, q2 = .20, q3 = .10, q4 = .14, q5 = .07. If the final quantity of final parts is 120,000 units, how many starting units will be required? There is no inspection or separation of defective units until after the final process, so defective units and good units are processed together through all production processes