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Random Variables and Measurable Functions.

Chapter 3 Random Variables andMeasurable MeasurabilityDefinition 42( Measurable function) Letfbe a function from a measurablespace( ,F)into the real numbers. We say that the function ismeasurableiffor each Borel setB B,theset{ ;f( ) B} 43( Random variable ) Arandom variableXis a Measurable func-tion from a probability space( ,F,P)into the real numbers<.Definition 44(Indicator Random Variables ) For an arbitrary setA FdefineIA( )=1if Aand0otherwise. Thisiscalledanindicator 45(Simple Random Variables ) Consider eventsAi F,i=1,2,3, .., nsuch that ni=1Ai= .DefineX( )=Pni=1ciIAi( )whereci <.

Random Variables and Measurable Functions. 3.1 Measurability Definition 42 (Measurable function) Let f be a function from a measurable space (Ω,F) into the real numbers. We say that the function is measurable if for each Borel set B ∈B ,theset{ω;f(ω) ∈B} ∈F. Definition 43 ( random variable) A random variable X is a measurable func-

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