Toyota Corp's stock is $25 per share. Its expected return is 21% and variance is 13%. Honda Corp's stock is $20 per share. Its expected return is 18% and variance is 7%. Benz Corp's stock is $40 per share. Its expected return is 12% and variance 6%. 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? Place your answer in decimal form, for example, as 0.14256 and not in percent form such as 14.256%