A jar contains 6 marbles marked with the numbers 1 through 6. You pick a marble at random. What is the probability of not picking the marble marked with the number 4? Enter your answer as a simplified fraction. The probability of not picking the marble marked with the number 4 is

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?