15.2.11 One dimensional random variables and their characteristics

Problem: The distribution table of the discrete random variable $\xi$ has the form: $$\text{Unknown environment 'tabular'}$$ Make distribution tables for random variables ${\tau }_i,i=1,2,3$ if: ${\tau }_1=-\xi ,{\tau }_2=|\xi |,{\tau }_3={\xi }^2$. Determine the expected values $E\left[{\tau }_i\right]$ and the dispersions $V\left[{\tau }_i\right],i=1,2,3$.