Returns and standard deviations [lo1] consider the following information: state of economy probability of state of economy rate of return if state occurs stock a stock b stock c boom good poor bust .10 .60 .25 .05 .35 .16 −.01 −.12 .40 .17 −.03 −.18 .27 .08 −.04 −.09 page 453 your portfolio is invested 30 percent each in a and c, and 40 percent in b. what is the expected return of the portfolio? what is the variance of this portfolio? the standard deviation? 11. calculating portfolio betas [lo4] you own a stock portfolio invested 20 percent in stock q, 30 percent in stock r, 35 percent in stock s, and 15 percent in stock t. the betas for these four stocks are .79, 1.23, 1.13, and 1.36, respectively. what is the portfolio beta?