A final assembly plant for Dictatape, a popular dictation company, produces the DT, a hand-held dictation unit. There are 400 minutes available in the final assembly plant for the DT, and the average demand is 80 units per day. Final assembly requires 6 separate tasks. Information concerning these tasks is given in the following table. Performance Time Task Must Follow Task (minutes) Task Listed Below A 1 — B 1 — C 4 A, B D 1 C E 2 D F 4 E a) Draw a precedence diagram of this operation b) Given the demand, what is the cycle time for this operation? c) What is the theoretical minimum number of work stations? d) Assign tasks to work stations. e) What is the overall actual efficiency of the assembly line?