using the following monthly return information, calculate the standard deviation of this asset. january is $-4\mathrm{.}16\%,$ february is $3\mathrm{.}10\%,$ march is $5\mathrm{.}17\%,$ april is $-4\mathrm{.}87\%,$ may is $3\mathrm{.}11\%,$ june is $0\mathrm{.}25\%$