What is the expectted return variance and standard deviation

What is the expectted return, variance, and standard deviation on a portfolio which is Invested 25 percent in stock A, 35 percent in stock B, and the remainder in stock C? What is the expected risk premium on the portfolio if the expected T-bill rate is 3.3 percent? Please remember to answer all 4 parts of the question: Expected Return Variance tandard Deviation isk Premium