An individual has $330 invested in a stock with a beta of 2.0 and another $2,170 invested in a stock with a beta of 0.50 . If these are the only two investments in her portfolio, what is her portfolio's beta? \begin{tabular}{|} \hline 2.000 \\ \hline 0.434 \\ 1.250 \\ 0.698 \\ 0.264 \\ \hline 0.500 \\ \hline \end{tabular}