Hankel Corp believes the following probability distribution exists for its stock. What is the standard deviation of the estimated returns? Round your intermediate calculations to at lease 4 decimal places. State of the Economy Boom Normal Recession Probability Stock's of State Occurring 0.22 0.38 0.40 Expected Return 28% 22% 10% 6.1762% 1.7547% O 13.2125% 7.3082% 0.5341%