i need help with this question

Consider the following information: a. Your portfolio is invested 25 percent each in Stocks A and C and 50 percent in Stock B. What is the expected return of the portfolio? (Do not round intermediate calculations. Enter your answer as a percent founded to 2 decimal places.) b-1. What is the variance of this portfolio? (Do not round intermediate calculations. Round your answer to 5 decimal places.) b-2. What is the standard deviation? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.)