An analyst has developed the following probability distribution for the rate of return for a common stock Scenario Probability Rate of Return 0.27 0.39 0.34 -4% 7% 27% a. Calculate the expected rate of return. (Round intermediate calculations to at least 4 decimal places. Round your answer to2 decimal places.) Expected rate of return 10.831 % b. Calculate the variance and the standard deviation of this probability distribution. (Use the percentage values for your calculations (for example 10% not 0.10). Round intermediate calculations to at least 4 decimal places. Enter your answer as a percentage rounded to 2 decimal places.) Variance Standard deviation 12.0 %