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Random Variables, Distributions, and Expected Value

Random Variables, Distributions, and Expected ValueFall 2001 Professor Paul GlassermanB6014: Managerial Statistics403 Uris HallThe Idea of a Random Variable1. Arandom variableis a variable that takes specific values with specific can be thought of as a variable whose Value depends on the outcome of an We usually denote Random variables by capital letters near the end of the alphabet; ,X,Y, Example: LetXbe the outcome of the roll of a die. ThenXis a Random variable . Itspossible values are 1, 2, 3, 4, 5, and 6; each of these possible values has probability 1 The word Random in the term Random variable doesnotnecessarily imply that theoutcome is completely Random in the sense that all values are equally likely.

Random Variables, Distributions, and Expected Value Fall2001 ProfessorPaulGlasserman B6014: ManagerialStatistics 403UrisHall The Idea of a Random Variable

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