Going back to the last problem of measuring performance of software developers, we would like to create a regression model that would describe how performance depends on work experience, professional certifications, and knowledge of various computer languages.

What is the $R-$square of this regression model?

$62\mathrm{.}7\%$

$8\mathrm{.}96\%$

$79\mathrm{.}2\%$

$45\mathrm{.}4\%$

$64\mathrm{.}7\%$