How do I find PMF if I have CDF? For example:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

F_X (x)=\left\{\begin{array}{cc}0,&\mbox{ if }x\leq -1

\\0.2, & \mbox{ if } -1\leq x < 0

\\0.7, & \mbox{ if } 0\leq x < 1

\\1, & \mbox{ if } x \geq 1

\end{array}\right.[/tex]

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# Finding Probability Using CDF

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