Below is a network diagram:

Below is a network diagram, with times shown in days. Use Table B1 and Table B2. Click here for the Excel Data File a. Determine the expected duration of the project. (Round intermediate calculations to 2 decimal places and final answer to 1 decimal place.) Compute the probability that the project will take at least 18 days. (Round intermediate calculations to 2 decimal places and Probability" values to 4 decimal places.)