- A
10.3 per year
Why wrong: This adds rather than multiplies.
- B
30 per year
Why wrong: This would be TEF divided by V, not multiplied.
- C
0.3 per year
Why wrong: This is just the vulnerability, not the product.
- D
3 per year
Correct: LEF = TEF × Vulnerability = 10 × 0.3 = 3.
Question 249 of 1,000
CRISC IT Risk Assessment Practice Question
This CRISC practice question tests your understanding of it risk assessment. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
During a quantitative risk analysis, the risk team calculates the loss event frequency (LEF) using the FAIR framework. If the threat event frequency (TEF) is 10 per year and the vulnerability (V) is 0.3, what is the LEF?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
3 per year
In the FAIR framework, loss event frequency (LEF) is calculated as the product of threat event frequency (TEF) and vulnerability (V). Given TEF = 10 per year and V = 0.3, LEF = 10 × 0.3 = 3 per year. This represents the expected number of loss events per year, accounting for the probability that a threat event will actually result in a loss.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
10.3 per year
Why it's wrong here
This adds rather than multiplies.
- ✗
30 per year
Why it's wrong here
This would be TEF divided by V, not multiplied.
- ✗
0.3 per year
Why it's wrong here
This is just the vulnerability, not the product.
- ✓
3 per year
Why this is correct
Correct: LEF = TEF × Vulnerability = 10 × 0.3 = 3.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the multiplicative relationship in FAIR with additive or divisive operations, or mistakenly treat vulnerability as the final frequency rather than a probability multiplier.
Detailed technical explanation
How to think about this question
The FAIR model defines LEF = TEF × V, where V is the probability (0 to 1) that a threat event will result in a loss event. This calculation assumes independence between TEF and V; in practice, V may be derived from control effectiveness assessments (e.g., vulnerability scoring per CVSS). Real-world scenarios, such as estimating annual phishing losses, use this formula to prioritize remediation efforts based on expected frequency.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CRISC exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Questions learners often ask
What does this CRISC question test?
IT Risk Assessment — This question tests IT Risk Assessment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 3 per year — In the FAIR framework, loss event frequency (LEF) is calculated as the product of threat event frequency (TEF) and vulnerability (V). Given TEF = 10 per year and V = 0.3, LEF = 10 × 0.3 = 3 per year. This represents the expected number of loss events per year, accounting for the probability that a threat event will actually result in a loss.
What should I do if I get this CRISC question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This CRISC practice question is part of Courseiva's free ISACA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CRISC exam.
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