Ann will rent a car for the weekend she can choose Oneof two plans the first plan has an initial fee of $55 and cost an additional of $0.12 per mile driven the second plan has an initial fee of $50 and cost an additional of $0.16 per mile driven. Can sum1 help me plz

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 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?