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(a) How many weeks in advance of the film release should Market Wise start its marketing campaign? What are the critical path activities? The tasks are as follows:

Table for Problem 11-27 Activity Immediate Predecessors Optimistic Time Most Likely Time Pessimistic Time Task 1 — 1 2 4 Task 2 — 3 3.5 4 Task 3 — 10 12 13 Task 4 — 4 5 7 Task 5 — 2 4 5 Task 6 Task 1 6 7 8 Task 7 Task 2 2 4 5.5 Task 8 Task 3 5 7.7 9 Task 9 Task 3 9.9 10 12 Task 10 Task 3 2 4 5 Task 11 Task 4 2 4 6 Task 12 Task 5 2 4 6 Task 13 Tasks 6, 7, 8 5 6 6.5 Task 14 Tasks 10, 11, 12 1 1.1 2 Task 15 Tasks 9, 13 5 7 8 Task 16 Task 14 5 7 9

(b) If Tasks 9 and 10 were not necessary, what impact would this have on the critical path and the number of weeks needed to complete the marketing campaign?