P$8-17$ Portfolio return and standard deviation David Choo is thinking of building an investment portfolio containing two stocks$-$H and G$.$ He has assigned $40\%$ of his portfolio to stock $H$ and the remaining $60\%$ to stock G$.$ David has decided to analyze some historical returns to get a sense for his portfolio's possible future risk and return. Six years of historical annual returns for each stock are shown in the following table.

$\backslash$table$[[,$Historical return$],[$Year$,$Stock H$,$Stock G$],[2014,8\%,12\%$