Use the following information on states of the economy and stock returns to calculate the standard deviation of returns.

Note: Do not round intermediate calculations. Enter your answer as a percent rounded to $2$ decimal places.

State of Economy Probability of State of Economy Security Return if State Occurs

Recession $0\mathrm{.}3510\mathrm{.}00\%$

Normal $0\mathrm{.}507\mathrm{.}00$

Boom $0\mathrm{.}1517\mathrm{.}00$