18 lines
760 B
Markdown
18 lines
760 B
Markdown
Lecture Topic: Random Variable
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Random Variable: Variable with a probability attributed to it
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Regular Variable: Variable that is more intrinsic, like height
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Discrete Variable: Variable where each possible value is a finite set or is an infinite set where each element is it's own distinct element, eg first element, second element etc.
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Probability Mass Function (pmf): The pmf of a discrete rv is defined for every number x by p(x) = P(X=x)
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Mass function criteria:
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- All probabilities have to been between 0 and 1
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- The total probabilities have to equal 1
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Expected Value: The summation of the value and the probability of x over the entire set
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Var?: Variance calculate the expected value but square the variable, then subtract the squared expected value
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