The expected project completion time for the construction of a pleasure yacht is 21 months and the project variance is 6. questions a) What is the probability that the project will require at least 17 months? b) What is the probability that the project will be completed within 20 months? c) What is the probability that the project will require at least 23 months? d) What is the probability that the project will be completed within 25 months? e) What is the probability that the project will take between 17 and 23 months to complete