answer this showing all working out

Question 4: (20 pts) An investor is considering 5 potential securities for investment. The securities include 3 stocks, a bond, and a 3-month Treasury bill for cash to achieve diversification. The following table gives the historical annual returns of the 5 securities for the 11 -year period, 20032013 Part (a): What is the investment risk for SLB and Cash expressed as a percentage? (10 pts) Part (b): What is the covariance of HON and Bond? KMB and Bond? (10 pts)