The past five monthly returns for Kohls are $3\mathrm{.}68$ percent, $3\mathrm{.}97$ percent, $-1\mathrm{.}82$ percent, $9\mathrm{.}32$ percent, and $-2\mathrm{.}70$ 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