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[PS] Start expected value
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\shortdefinition[Pinhole projection]
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$\begin{bmatrix}
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u \\ v
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\end{bmatrix}
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= \frac{f}{z}
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\begin{bmatrix}
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x \\ y
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\end{bmatrix}$
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with $f$ the distance to the lens and $z$ the full distance
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\subsection{Allgemeiner Erwartungswert}
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\shortdefinition Für $\cX : \Omega \rightarrow \R_+$, $\E[\cX] = \int_{0}^{\8} (1 - F_\cX(x)) \dx x$
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\shortremark $\E[\cX]$ immer definiert und endlich oder unendlich
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\shorttheorem $\cX$ n.-neg. Dann: $\E[\cX] \geq 0$. $=$, wenn $\cX = 0$ fast sicher
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\shortdefinition $\E[\cX] = \E[\cX_+] - \E[\cX_-]$ mit $\cX_-$ auch n.-neg.
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\shortremark $|\cX| = \cX_+ + \cX_-$. Für $\cX \geq 0$ ist $\E[\cX]$ immer definiert.
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Falls $\cX$ kein konst. Vorzeichen, $\E[\cX]$ undef.
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\shortremark $\E[\cX] = \int_{0}^{\8} (1 - F_\cX(x)) \dx x - \int_{-\8}^{0} F_\cX(x)$
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\subsection{Diskrete Zufallsvariablen}
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\shorttheorem Für $\cX$ mit Werten fast sicher in $W$:
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\[
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\E[\cX] = \sum_{x \in W} x \cdot \P[\cX = x] = \sum_{x \in W} x \cdot p_\cX(x)
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\]
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\shortremark $\E[\cX]$ wohldefiniert falls $(x \cdot p_\cX(x))_{x \in W}$ abs. konv.
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\subsubsection{Beispiele}
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\begin{itemize}
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\item $\cX \sim \text{Ber}(p)$: $\E[\cX] = p$
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\item $\cX \sim \text{Bin}(n, p)$: $\E[\cX] = np$
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\item $\cX \sim \text{Poisson}(\lambda)$: $\E[\cX] = \lambda$
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\end{itemize}
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\input{parts/02_discrete-continuous-rv/05_cont-distributions/03_normal.tex}
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\input{parts/02_discrete-continuous-rv/05_cont-distributions/03_normal.tex}
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% \input{parts/02_discrete-continuous-rv/}
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% \input{parts/02_discrete-continuous-rv/}
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\newsectionNoPB
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\section{Erwartungswert}
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\input{parts/03_expected-value/00_cont.tex}
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\input{parts/03_expected-value/01_disc.tex}
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% \input{parts/03_expected-value/}
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\end{document}
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\end{document}
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