Problem $9-17$ Standard Deviation $($LG$9-3)$

The past five monthly returns for Kohl's are $3\mathrm{.}60$ percent, ${3\mathrm{.}77}^4$ percent, $-1\mathrm{.}74$ percent, $9\mathrm{.}28$ percent, and $-2\mathrm{.}62$ percent. Compute the standard deviation of Kohls' monthly returns. $($Do not round intermediate calculations. Round your answer to $2$ decimal places.$)$

Answer is complete but not entirely correct.

Standard

deviation

$\%$