1. Gaddar Roofs Inc is working on a project to install roofing in commercial offices. Johny Gaddar is concerned about project completion time due to the reliability of his workers. Below is a list of activities, their respective optimistic, most likely, and pessimistic completion times (in days), their predecessors, and information about activity crashing for a new contract: A. Determine the expected completion time and variance for each activity. B. Calculate the Early Start (ES), Early Finish (EF), Late Start (LS), Late Finish (LF), and slack for each activity. C. Determine the total project completion time and identify the critical path for the project. D. What is the probability that Gaddar Roofs Inc will finish the project in 25 days or less? E. Calculate the cost to crash each activity to its crash duration while maintaining the minimum project duration. F. What is the minimum cost to complete the project in the 25 Days? Write you answers in the area provided and upload your work and table