please onky answer if it is completely correct. i posted earlier and it was all wrong and i gave bad review

eBook Consider an investment with the following probability distribution: Probability Payoff 0.40 38.0% 0.40 -5.0 0.20 - 18.0 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 Grade It Now Save & Continue Continue without saving