A project being analyzed by PERT has 38 activities, 16 of which are on the critical path. If the estimated time along the critical path is 90 days with a project variance of 25 . What is the probability that the project will be completed in 88 days or less? Case5 A PERT project has 45 activities, 19 of which are on the critical path. The estimated time for the critical path is 120 days. The sum of all activity variances is 64 , while the sum of variances along the critical path is 36 . What is the probability that the project can be completed between days 108 and 120 ? Case 6 A contractor's project being analyzed by PERT has an estimated time for the critical path of 120 days. The sum of all activity variances is 81 ; the sum of variances along the critical path is 64 . What is the probability that the project will take 130 or more days to complete? Case 7 Two activities ( B and C ) are candidates for crashing on a CPM network. Activity details are in the table below. To cut one day from the project's duration, activity should be crashed first, adding to project cost