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Calculate the ex post standard deviation of returns for the

following: $46$ percent, $26$ percent, $21$ percent, $31$ percent, $51$

percent. $($Round intermediate calculations to $4$ decimal places, e$.$g$.$

$31\mathrm{.}2125$ and final answer to $2$ decimal places, e$.$g$.15\mathrm{.}25\%.)$

Ex post standard deviation