Consider the following returns and states of the economy for Lexington Corporation: Economy Probability Return Weak 40% 4% Normal 50% 9% Strong 10% 40% What is the standard deviation of the firm's returns? SET YOUR CALCULATOR TO FOUR DECIMAL PLACES AND ROUND TO 2 DECIMAL PLACES AT THE END. DO NOT ENTER THE %. FOR EXAMPLE, IF YOUR ANSWER IS 7.7011% ENTER IT AS 7.70