Consider an investment with the following probability distribution: Probability Payoff 0.50 22.0% 0.35 -2.0 0.15 -10.0 a. Calculate the expected return. Do not round intermediate calculations. Round your answer to two decimal places. % b. Calculate the standard deviation. Do not round intermediate calculations. Round your answer to two decimal places. % c. Calculate the coefficient of variation. Do not round intermediate calculations. Round your answer to two decimal places.