6.041-lec1

lecture outline

  • Probability as a mathematical framework for resoning about uncertainty
  • Probabilistic models(sample space, probability law)
  • Axioms of probability

Sample spaceOmega

  • "list" (set) of possible outcomes
  • list (Mutually exclusive, Collectively exhaustive)
  • Art: to be at the "right" granularity
  • Discrete example
  • Continuous example

Probability axioms

  • Event : a subset of the sample space
  • Probability is assigned to events

Discrete uniform law

  • P(A) = number of elements of A / total number of sample points
  • Computing probabilities == counting

Continuous uniform law

  • Uniform law: probability = Area

Probability law

  • if A1, A2, ... are disjoint events, then:
    P(A1 and A2 and ... ) = P(A1) + P(A2) + ...

Topic of probabilities

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