This question illustrates the cost of defects in a serial system.
Use the serial system with defects simulation model (Manu 2.mox)
in the Examples/Models and Methods folder. Run the simulation
to estimate the time it takes produce a lot of 50 non-defective
parts. Gather data on the number of defects produced and the
time required to produce 50 non-defective parts. Make several
runs to determine a 95% confidence limit for the time required.