please esplain step by step how to complete this problem

Using PERT, Adam Munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 24 months, and the project variance is 16 . a) The probability that the project will be completed in 8 months = (round your response to four decimal ploces). b) The probability that the project will be completed in 23 months = (round your respanse to four decimar places). c) The probability that the project will be completed in 28 months a (round your response to four decimal places). d) The probability that the project will be completed in 40 months = (round your response fo four decimal piaces). e) The due date that yields a 95% chance of completion = months (round your response to two decimal places)