The energy-hub case makes the mechanics inspectable. A schedule network, duration ranges, direct-cost uncertainty, discrete threats, an opportunity and time-dependent cost contribute to the forecast. You question these inputs before interpreting the curves. The model deliberately simplifies a live project, giving you a manageable setting in which to examine missing factors and assumptions.
A percentile is conditional on that model. Separate P80 time and cost values do not establish 80% confidence of meeting both. You examine the intersection of the outcomes and explain the consequence for a combined commitment. Similarly, the difference between a modelled cost percentile and a reference estimate is not automatically an authorised reserve: existing provision, scope, confidence, ownership and release authority must be reconciled.
Compare the supplier response with its cost included, then test weaker response effectiveness and altered assumptions. Your recommendation should identify what evidence would justify acting and what should be checked first. This develops professional interpretation alongside the foundation knowledge required for the Level 1 examination.