Given the following probability distribution, please answer question $1$ and $2.$

State Pr i rJ

$10\mathrm{.}210\%$

$20\mathrm{.}85\%$

$1.$ What is the expected return for Security J$?$

$2.$ What is the standard deviation of returns for Security J$?$

$3.$ If we assume that asset X has an expected return of $0\mathrm{.}1$ and a standard deviation of $0\mathrm{.}25,$ then what is the asset$$s coefficient of variation?$4.$ If the expected return on Stock $1$ is $6\%,$ and the expected return on Stock $2$ is $20\%,$ what is the expected return on a two$-$asset portfolio that holds $70\%$ of its funds in Stock $1$ and $30\%$ in Stock $2?$