D Question 15 1 pts Consider the following returns and states of the economy for Neptune Corporation: Economy ProbabilityReturn Weak 40% 3% Normal 50% 14% Strong 10% 19% 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