1. Give an example of an activity that you might encounter in a project where duration cannot be determined with absolute certainty.
2. For that example, provide an optimistic (a), pessimistic (b) and most likely (m) duration.
3. How might you estimate these durations?
4. What is the expected value duration (TE) for this activity?
5. What is the standard deviation, assuming that the range of (a) to (b) covers 90% of all possible outcomes?