An analyst has developed the following probability distribution for the rate of return for a common stock. Scenario Probability Rate of Return 1 D. 30 5% 2 U. 45 0% 3 D. 25 10% a. Calculate the expected rate of return. [Round intermediate calculations to at least 4 decimal places.) Expededrateofrelum -% 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 952 Standard deviation '36