Need help with b-1 and b-2

Consider the following information: Your portfolio is invested 25 percent each in A and C, and 50 percent in B. What is the expected return of this particle? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places. Omit the "%" sign in your response.) Expected return 3.74 % What is the variance of this portfolio? (Do not round intermediate calculations. Round your answer to 5 decimal places.) variance of this portfolio _____ What is the standard deviation? (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) Standard deviation _____ %