17.22% is not correct

Problem 10-18 Expected Return Risk (LG10-1) Following are three economic states, their likelihoods, and the potential returns: Economic State Fast growth Slow growth Recession Probability 0.17 0.50 0.33 Return 21% 10 -21 Determine the standard deviation of the expected return. (Do not round intermediate calculations and round your answer to 2 decimal places.) Standard deviation %