An analyst developed the following probability distribution for the rate of return for a common stock. Scenario Probability Rate of Return 1 6.32 5% 2 6.39 1% 3 6.29 12% a. Calculate the expected rate of return. (Do not round intermediate calculations. Round your final answers to 2 decimal places.) Rate of return _ % b. Calculate the variance and the standard deviation of this probability distribution. (Round intermediate calculations to at least 4 decimal places. Round your final answers to 2 decimal places.) Variance Standard deviation