On this page
Begin with signs and a cumulative table
Read the loss-sign lesson, record the common period and unit, then build the original cumulative table. Locate the lower 90% and exact 95% crossings and explain why they are both 10.
Add the selected-mass bridge
Calculate the worst 10% average and check the 5%/5% inclusion split. Compare it with strict and inclusive threshold averages before calling those definitions interchangeable.
Use a task progression
| Task | Evidence of understanding |
|---|---|
| Quantile | Stated rule and first crossing |
| Expected shortfall | Exact mass and denominator reconcile |
| Sample rank | Equal-weight convention stated |
| Aggregation | Joint probabilities constructed |
| Communication | Model scope and unresolved data retained |
Review causes rather than a score alone
Use the three original practice sets, retain the reason behind any incorrect choice and revisit the relevant example. Completion does not certify official syllabus coverage, professional competence or a pass outcome.