Moderator: Intaver Support
In the case of schedules, the distribution almost always tend to be right skewed as there is a finite amount that it can shorten, but an infinite amount that it could extend (possibly never be finished). Because of this right skewedness, the Mode (most likely), P50, and the Mean begin to diverge.
Lets take a look at the below graph. If we look at the left, we can see that the Mean is ~ 11 days, and the P50 is 10.8. The most likely is even farther to the left somewhere around 10 days.
Therefore, generally the Mean is a slightly higher level of confidence (finish at or before) than the P50. In the case below, the Mean represents about P55.
Intaver Institute Inc.
Home of Project Risk Management and Project Risk Analysis software RiskyProject