Ms. lieber takes 4 hours to drive 210 miles from her home to yosemite national park . if miss lieber's average speed for the first two hours is 60 miles per hour, find her average speed for the last 2 hours

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?