Answer:
Portfolio expected return = 8%
Portfolio SD = 9%
Explanation:
Portfolio return is a function of the weighted average return of each stock or asset invested in the portfolio. The mean return on portfolio can be calculated using the following formula,
Portfolio return = wA * rA + wB * rB + wN * rN
Where,
Total investment in portfolio = 60000 + 40000 = 100000
Portfolio return = 60000/100000 * 10% + 40000/100000 * 5%
Portfolio return = 8%
The standard deviation of a portfolio containing one risky and one risk-free asset is calculated by multiplying the standard deviation of the risky asset by its weight in the portfolio. So, portfolio standard deviation will be,
Portfolio SD = 60000/100000 * 15%
Portfolio SD = 9%