Conditional and Marginal Probability Functions for Discrete Random Variables
Free SOA Exam P (Probability) lesson in Multivariate Random Variables. 17 min read, ~2,523 words.
Marginal PMF: sum the joint over the other variable, row totals or column totals. Conditional PMF:, divide by the row total. Joint = Conditional times Marginal:. Law of total probability:. Bayes reverses conditioning:.
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What this lesson covers
- Content
- Example 1
- Example 2
- Example 3
- Common Mistakes
- Key Takeaways
- Exam Shortcuts
Learning objectives
- 3b
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