(Solved): The expected return on ZV next year is 12% with a standard deviation of 20%. The expected return on ...

The expected return on ZV next year is $12\%$ with a standard deviation of $20\%$. The expected return on TNA next year is $24\%$ with a standard deviation of $30\%$. The correlation between the two stocks is -0.6 . If an investor makes equal investments in ZV and TNA, what is the standard deviation of the portfolio? (use a percentage number, rounded to the nearest 100th, without $\%$ sign. For example, $12.345\%\Rightarrow 12.35$ ) *This question has a weight of two correctness points. Typed numeric answer will be automatically saved.