Help with this question please, also how you got the answer

Question 31 1 pts John would like to invest in oil futures and is aware that the returns on such an investment can be volatile. Use the following table of states, probabilities, and returns to: Probability Return Boom 0.30 40.00% Good 0.20 30.00% OK 0.50 15.00% The confidence interval that captures 90% of possible returns - 0.322: -0.113 O 0.522; -0.223 0.437;0.073 O 0.544: 0.633