$-$ For a the given data gathered from the bottom raw of a data table related to a sample of $10$ individuals:

$\stackrel{}{x}=10\mathrm{.}50\frac{,}{b}ar(y)=10,(x_i-(\stackrel{}{x}){)}^2=118\mathrm{.}50,(y_i-(\frac{?}{\text{b}\text{a}\text{r}}(y)){)}^2=205,$

${\displaystyle \underset{?}{\overset{?}{}}}(x_i-(\stackrel{}{x}))(y_i-(\frac{?}{\text{b}\text{a}\text{r}}(y)))=-31$

Evaluate the following: $s_x,s_y$ and cov$(x,y),$ then calculate the correlation coefficient $r?$