Problem 11-2 Standard Deviations (LO1, CFA2) Use the following information on states of the economy and stock returns to calculate the standard deviation of returns. (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) Probability Security State of Return if State State of Economy 0.35 0.20 0.45 Economy Recession Norma1 Boom Occurs -5.50% 12.00 19.00 Standard deviation