calculate the expected return and standard deviation (with details, please)

TABLE 8.5 Returns of Zig, Peat, and 50-50 Portfolio of Zig and Peat State of Economy Boom Probability of State Retum of Zig Company 40% Return of Peat Company Return of Portfolio 31.0% 0.20 22% Steady 12% 15% 0.50 0.30 13.5% -4.5% Recession 5% Eln) 12.5% 10.7% 11.6%