The expected project completion time for the construction of a pleasure yacht is 21 months and the project variance is 6. questions (Note: when using the Z tables -round your Z values to two decimal places before getting the probabilities from the tables.DO NOT round standard deviations prior to calculating Z values)

NOTE: Enter probabilities as decimals (i.e 92.31% shouldbe entered as 0.9231)

a) What is the probability that the project will require at least 17 months? (Enter 4 decimal places)

b) What is the probability that the project will be completed within 20 months? (Enter 4 decimal places)

c) What is the probability that the project will require at least 23 months? (Enter 4 decimal places)

d) What is the probability that the project will be completed within 25 months? (Enter 4 decimal places)

e) What is the probability that the project will take between 17 and 23 months to complete? (Enter 4 decimal places)