The past five monthly returns for Kohls are $3\mathrm{.}60$ percent, $3\mathrm{.}77$ percent, $-1\mathrm{.}74$ percent, $9\mathrm{.}28$ percent, and $-2\mathrm{.}62$ 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