Answer:
- Standard Deviation = 18.9%
Step-by-step explanation:
Expected Return will be the weighted average of the return from the T-bill and your risky portfolio.
With 70% invested in the risky portfolio and 30% invested in T-bills and a return of 17% from the portfolio and 7% from the T-bills, return is;
= ( 0.7 * 17%) + ( 0.3 * 7%)
= 14%
Standard deviation is a measure of risk and is also a weighted average of the standard deviation of the two vehicles. Bear in mind that T-bills are guaranteed by the US Government and so are considered risk-free.
Standard deviation of the portfolio is;
= (0.7 * 27%) + ( 0.3 * 0)
= 18.9%