b. What is the probability that the project will be finished in 200 days or less? c. What is the probability that the project will take between 160 to 180 days to be completed? d. What is the probability that the project will take at least 260 days to be completed? e. If we want a 97% chance of completing the project on time, how far ahead of the schedule meeting time should the project be started? please do on excel.