your portfolio has 25% of its value invested in Vance Trucking (Vance) and the remainder invested in Charter Oil and Gas (Charter). Vance stock has an expected return of 9%, and volatility (standard deviation) of 30%. Charter stock has an expected return of 6% and volatility (standard deviation) of 18%.

If the correlation between Vance and Charter is -0.5, what is the expected return and standard deviation of your portfolio?