Suppose that the index model for stocks A and $B$ is estimated from excess returns with the following results:

$R_A=2\mathrm{.}0\%+0\mathrm{.}40R_M+e_A$

$R_B=-1\mathrm{.}8\%+0\mathrm{.}9R_M+e_B$

${}_M=15\%$;$R-$square $A=0\mathrm{.}30$;$R-$square $B=0\mathrm{.}22$

What is the standard deviation of each stock?

Note: Do not round intermediate calculations. Round your answers to $2$ decimal places.

$\backslash$table$[[,$Standard Deviation$],[$Stock A$,,\%$