CDF and RDF Example

With

$$p_X(x)=\{\begin{array}{ll}\frac{1}{2},& x=1\\ \frac{1}{3},& x=2\\ \frac{1}{6},& x=3\end{array}$$ 0 & x < 1\\ \frac{1}{2} & 1 \leq x < 2\\ \frac{5}{6} & 2 \leq x \leq 3\\ 1 & x \geq 3\\ \end{cases}$$