2 5 points You are the project manager for a construction project involving the renovation of a historic building. The project is divided into four major tasks: Task A, Task B, Task C, and Task D. Each task has its own estimated duration, and task dependencies must be considered. Project Task Details: Task A (Site Preparation): . Task B (Structural Restoration): . Task C (Architectural Design and Interior): Task D (Final Inspection and Handover): Task Dependencies: . Task A must be completed before Task B can start. Task B and Task C can be worked on in parallel but cannot start until Task A is complete. Task D depends on the successful completion of Task B and Task C. Task Optimistic time Most likely time Pessimistic time A 2 3 B 4 6 40 C 8 11 D 3 4 7 Based on PERT: 1. Determine the expected project duration for each task. 2. Determine the variance for each task.5 points You are managing a construction project to build a residential complex consisting of multiple apartment buildings. The project involves various phases, including excavation, oundation laying, framing plumbing, electrical work, and finishing. You have hired a team of skilled workers for the project, and they have completed the initial phase in the first month. Based on their performance so far, you have gathered the ollowing information: The learning rate for the construction workers in completing tasks related to framing is determined to be 0.85. The steady state time required to complete the framing phase is 30 days. The construction project includes FOUR major phases for framing. Using the provided case study and information, answer the following questions: 1. Estimate the time needed for the first iteration of the framing phase. 2. Estimate the total time required to complete the entire construction project, considering the learning rate. 3. Calculate the total labor cost for the project if the wage for construction workers is $70 per day. (Neglect overhead rate or an indirect costs.)