Final answer:
To find the portfolio's beta, calculate the weighted average of the individual stock betas based on their investments.
Step-by-step explanation:
To find the portfolio's beta, you need to calculate the weighted average of the individual stock betas based on their investments. The formula for weighted average is:
Beta of Portfolio = (Value of Investment in Stock 1 / Total Portfolio Value) * Beta of Stock 1 + (Value of Investment in Stock 2 / Total Portfolio Value) * Beta of Stock 2
Plugging in the values, we get:
Beta of Portfolio = (10,000 / 65,000) * 0.8 + (55,000 / 65,000) * 1.5
Calculating this equation results in a portfolio beta of approximately 1.28.