The table below lists the work elements in minutes) to be performed on an assembly line and the precedence requirements that must be satisfied. Annual demand for the product will be 60.000 units. The line will operate one shift (2000 hr/yr). Expected line efficiency (proportion uptime) is 95% Repositioning time per cycle is 6 sec. Manning level is 1.0 for all stations. The products will be moved through the line by conveyor at a speed of 4 ft/min. All stations are of equal length, which is 10 ft. Determine the theoretical minimum number of workers. Work element 2 3 5 6 7 8 9 10 11 12 13 Time (minutes) 0.5 0.3 0.8 0.6 0.2 0.7 1.0 0.4 0.9 1.3 Preceded by 1,2 3 6 10,11,12 1 4 1.1 1.2 5 0.1 8.9 1 2 4 5 7