The past five monthly returns for Kohls are $3\mathrm{.}64$ percent, $3\mathrm{.}87$ percent, $1\mathrm{.}78$ percent, $9\mathrm{.}30$ percent, and $2\mathrm{.}66$ percent. Compute the standard deviation of Kohls monthly returns.Note: Do not round intermediate calculations and round your final answer to $2$ decimal places.