A valve is assembled in two process cells by one worker in each cell, The first worker inserts spring and stem into the body with a TRIA(1,2,3) seconds process time; The second Worker closes the valve and test for leaks in TRIA (5,10,15) seconds. The valve parts arrive into the system at the rate of EXPO(15) seconds. Assume that about 3% of the assembled valve stems fail and must be disassembled by a machine within TRIA(1,2,3) seconds. The disassembled valves are reworked in stage 1 with the same process time as before. The valves must be reworked only once and any that fail after the one rework must be discarded. a. Show the model and all the relevant statistics about the process wait times and resource availabilities. Run the simulation for one shift of 8 hours. Estimate all averages with the half width of the 95 % CI within about 10 % of the mean. b. Determine approximately how many shifts of 8 hours will be required to assemble 100,000 parts.