The past five monthly returns for Kohls are $3\mathrm{.}76$ percent, $4\mathrm{.}17$ percent, $-1\mathrm{.}90$ pe nt $9\mathrm{.}36$ percent, and $-2\mathrm{.}78$ 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