As a Project Manager, you are estimating the duration of your project activities using PERT technique (Program Evaluation and Review technique). For a particular project activity your Optimistic estimate is 16 days, Pessimistic estimate is 42 days, and Most Likely estimate is 27 days. What should be the expected duration of this activity? a. 22.17 b. 35.17 c. 36 d. 27.67