Denver Telecoms and Steel Company is expanding its operations to include a new drive in weight station. The weight station will be heated air conditioned building with a large floor and small office. The large room will have the scales a 15-foot counter and several display cases for its equipment. Before erection of the building the project manager evaluated the project using PERT analysis. The activities with their corresponding times were recorded in the following table. Using PERT analysis find the critical path, the slack times and the expected completion time. What is the probability that the project will be completed before 70 days?