What would be the portfolio standard deviation if the two investments in problem 3 had a correlation

Question:

What would be the standard deviation if the two investments in problem 3 had a correlation coefficient (rij) of +0.40? 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...