Please help for the part E

Using PERT, Adam Munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 16. a) The probability that the project will be completed in 5 months = 0.0032 (round your response to four decimal places). b) The probability that the project will be completed in 20 months = 0.4013 (round your response to four decimal places). c) The probability that the project will be completed in 25 months = 0.8413 (round your response to four decimal places) d) The probability that the project will be completed in 37 months = 1.0000 (round your response to four decimal places). e) The due date that yields a 95% chance of completion = months (round your response to two decimal places)