Assets X and Y are perfectly positively correlated. The standard deviations are X = 0.312 and Y

Question:

Assets X and Y are perfectly positively correlated. The standard deviations are X = 0.312 and Y = 0.426. What is the standard deviation of a with weights wX = 40% and wY = 60%?
Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...