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Probability, Conditional Probability & Bayes Rule

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Probability , Conditional Probability & Bayes RuleA FAST REVIEW OF DISCRETE Probability (PART 2)CIS 391-Intro to AI2CIS 391-Intro to AI3Discrete random variables A random variable can take on one of a set of different values, each with an associated Probability . Its value at a particular time is subject to random variation. Discreterandom variables take on one of a discrete (often finite) range of values Domain values must be exhaustiveand mutually exclusive For us, random variables will have a discrete, countable (usually finite) domain of arbitrary values.

Probability of a proposition is the sum of the probabilities of elementary events in which it holds • P(cavity) = 0.1 [marginal of row 1] • P(toothache) = 0.05 [marginal of toothache column]!!! CIS 391- Intro to AI 7 Joint probability distribution toothache toothache cavity 0.04 0.06 cavity 0.01 0.89 a

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