Toyota Corp's stock is $32 per share. Its expected return is 20% and variance is 11%. Honda Corp's stock is $21 per share. Its expected return is 17% and variance is 9%. Benz Corp's stock is $50 per share. Its expected return is 15% and variance 7%. The covariance between Toyota and Honda is 0.06. What would be the standard deviation of a portfolio consisting of 50% Toyota and 50% Honda