Stocks a and b have the following probability distributions of expected future returns: probability a b 0.1 (12%) (38%) 0.2 6 0 0.4 16 19 0.2 23 26 0.1 39 41 calculate the expected rate of return, rb, for stock b (ra = 14.90%.) do not round intermediate calculations. round your answer to two decimal places. % calculate the standard deviation of expected returns, σa, for stock a (σb = 20.51%.) do not round intermediate calculations. round your answer to two decimal places. % now calculate the coefficient of variation for stock b. round your answer to two decimal places.