Question: please explain steps for 1-4 15. A contractor's project being analyzed by PERT has an estimated time for the critical path of 120 days. The

please explain steps for 1-4

15. 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. (1) What is the probability that the project will take 130 or more days to complete? (2) What is the probability that the project will take 108 or less days to complete? (3) What is the probability that the project will be finished between 108 and 130 days? (4) Please identify and date by which the project will be finished with a 99% probability

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