a m 3. (Chapter 3: 20 points). Canada is near the front of the line to get millions of doses of four of the most promising COVID-19 vaccines in development. It is March 2020. A local pharmaceutical company has decided to develop vaccines for COVID-19. The company has signed a contract with the Government of Canada to deliver millions of doses of COVID-19 vaccines. The company wants to know how long it will take to develop and release vaccines. The following table provided a slightly simplified process for vaccines development and release in Canada The relevant tasks involved, their immediate predecessors, and their time estimates are shown in the following table. Activity Immediate Time estimates Mean Variance Predecessor(s) (weeks) time (6) b (0) A Identify strains None 12 16 20 B Prepare hybridized viruses A 6 12 18 C Verify hybrid viruses B 2 6 10 D Distribute hybrid viruses to 4 8 24 manufacturings E Develop testing reagents 4 6 8 F Setup manufacturing D 6 8 10 G Manufacturer vaccine F 4 4 4 HTest vaccine in house E,G 6 14 22 I Vaccine packaging and release H 4 8 12 J Clinical test I 2 8 14 K Review and release vaccine (Health I 2 20 26 Canada) e) Suppose the government, frustrated with delayed developments, has told the operations manager of the pharmaceutical company that if the vaccine is not ready within 75 weeks, it will seek alternative sources. What is the probability that the company delivers the vaccines to the Government of Canada with 75 weeks? (2)