please help solve the below and shoe work

CH 13: According to the table below, what is the expected return of Asset A? What is the standard deviation of Asset A? CH 13: What are the weights for a portfolio with an investment of $7,000 in asset X and $3,000 in asset Z ? Suppose E[RX]=10%,X=5%,E[Rz]=20%,Z=10%,XZ=0.2. What is the expected return of your portfolio? What is the standard deviation of your portfolio? If Xz=1 (and assuming everything else is the same), what is the standard deviation of your portfolio