7. Stock A's rate of return has a standard deviation of A >0 and an expected value of A. The risk-free rate is equal to rf. Consider a portfolio consisting of the risk-free asset and of Stock A. If its rate of return has a standard deviation of op, what is the portfolio's expected return? Using only the information provided above, state the expression for E[rp]. 7. Stock A's rate of return has a standard deviation of A >0 and an expected value of A. The risk-free rate is equal to rf. Consider a portfolio consisting of the risk-free asset and of Stock A. If its rate of return has a standard deviation of op, what is the portfolio's expected return? Using only the information provided above, state the expression for E[rp]