Consider the following returns and states of the economy for Neptune Corporation Economy Probability Return Weak 20% -1% Normal 20% 3% Strong 60% 25% 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 7.7012% ENTER IT AS 7.70