security risks

The CFO of an investment company compiled the following financial information on 4 securities / cash Expected returns Standard deviation Financial Beta (%) assets (%) 0.1 6 4 1 1.75 18 25 2 0.25 16 8 3 1 8 12 4 1. Which security has the greatest overall risk ? 2. which security that has the greatest market risk? 3. which security that has the lowest market risk? 4. which security that you recommend investing in? 5. which security that you do not recommend to invest in? 6.Find the coefficient of variation for the financial market