Suppose Sarah has a portfolio of stocks and bonds with the following characteristics:

• Stock Portfolio:
  • Expected Return: 10%
  • Standard Deviation: 15%
• Bond Portfolio:
  • Expected Return: 5%
  • Standard Deviation: 8%

Sarah wants to optimize her portfolio allocation to maximize her expected return while minimizing her portfolio's overall risk. She aims to allocate 70% of her investment in stocks and 30% in bonds. Calculate the expected return and standard deviation of Sarah's optimized portfolio.