The "Electric Distribution Network Construction" project has the activity network diagram and estimated durations as shown below: Project: Electric Distribution Network Construction Duration [weeks Mont Activity Optimistic Likely Pessimistic 12 30 98 F 6 Useful Formulas: - most optimistic most likely 1 +41 +1 (12 -1) - most pessiunstic 6 6 r, - expected duration - vance Using the PERT method, calculate the expected duration of the project O 46 Weeks 41 Weeks 27 Weeks O 55 Weeks