Assume that you formed a portfolio of three stocks, X, Y, and Z. The stock X's beta is 1.5, stock Y's beta is 2, and stock Z's beta is 0.5. If the weight of your wealth invested in stock X is 0.4, the...

Assume that you formed a portfolio of three stocks, X, Y, and Z. The stock X's beta is 1.5, stock Y's beta is 2, and stock Z's beta is 0.5. If the weight of your wealth invested in stock X is 0.4, the weight invested in stock Y is 0.2, find the portfolio's beta.