Question 15 1 pts Consider the following returns and states of the economy for Neptune Corporation Return -5% Economy. Probability. Weak 20% Normal 20% Strong 60% 8% 18% 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