Compute the expected return and standard deviation of a portfolio consisting of three stocks with weights w1=40%,w2=10% and w3=70%, given that the stocks have expected returns 1=10%,2=8% and 3=20%, standard deviations 1=1.3, 2=0.4, and 3=1.7, and correlations 12=0.1,23=0.2, and 13=0.7