will you please explain step by step how to solve this problem? i know the answers are there already i just need to undertand how to do it for the future. thanks :)

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 places). b) The probability that the project will be completed in 23 months = (round your responso to four decimal places). c) The probability that the project will be completed in 28 months m (round your response to four decimal places). d) The probability that the project will be comploted in 40 months = (round your response fo four decimal places). e) The due date that yields a 95% chance of completion = months (round your response to two decimal places)