Expected Value

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$ E[X] = (\sum_(i=1)^n (X_i)) $
$ E[X+Y] = E[X] + E[Y] $
$ E[cX] = cE[X] $
$ E[X*Y] =E[X] E[Y] $

가정: X 와 Y 가 서로 독립적 (independent) 일때
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