The following returns are provided from the past:

$\backslash$table$[[$Condition$,$Retum,Probability$],[$Recession$,1\%,\mathrm{.}23],[$Normal$,5\%,\mathrm{.}42],[$Expansion$,9\%,\mathrm{.}21],[$Boom$,13\%,\mathrm{.}14]]$

Calculate the standard deviation.

$4\mathrm{.}34\%$

$3\mathrm{.}21\%$

$9\mathrm{.}38\%$

$3\mathrm{.}86\%$

none of these