Calculate the expected return, variance of returns, standard deviation of returns, and coefficient of variation for the following stock. Use at least five decimal places in computation of the variance to avoid significant rounding errors.

$\backslash$table$[[$State of Economy,Probability,Return$],[0\mathrm{.}10,0\mathrm{.}30($or $30\%)],[$Good$,0\mathrm{.}20,0\mathrm{.}25($or $25\%$