A financial analyst wants to assess the risk and return characteristics of two investment portfolios: Portfolio A and Portfolio B$.$ Portfolio A consists of $60\%$ stocks and $40\%$ bonds, while Portfolio B consists of $80\%$ stocks and $20\%$ bonds. The historical returns for stocks and bonds are $10\%$ and $5\%$ respectively. Calculate he expected return and standard deviation for each portfolio. Compare the risk$-$return profiles of Portfolio B and discuss the implications for investment decision$-$making.