The past five monthly returns for Kohls are $3\mathrm{.}84$ percent, $4\mathrm{.}37$ percent, $-1\mathrm{.}98$ percent, $9\mathrm{.}40$ percent, and $-2\mathrm{.}86$ percent. Compute the standard deviation of Kohls' monthly returns.

Note: Do not round intermediate calculations and round your final answer to $2$ decimal places. $$

Standard deviation