CRISC IT Risk Assessment Practice Question
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?
⚠ Common exam trap
Many exam-takers confuse the multiplicative relationship in FAIR with additive or divisive operations, or mistakenly treat vulnerability as the final frequency rather than a probability multiplier.
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.
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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