$8-1$ Calculate the

$($a$)$ expected return,

$($b$)$ standard deviation, and

$($c$)$ coefficient of variation for an investment with the following probability distribution: $($LO $8-2)$

$\backslash$table$[[$Probability$,$Payoff$],[0\mathrm{.}45,32\mathrm{.}0\%],[0\mathrm{.}35,-4\mathrm{.}0],[0\mathrm{.}20,-15\mathrm{.}0]]$