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Security A and Security B has the following probabilities and returns: Required: 6.1. Calculate the expected rate of return for Security A and Security B (3) (3) 6.2. Calculate the standard deviations for Security A and Security B (3) 6.3. Calculate the coefficient of variation for Security A and Security B (3) 6.4. Suppose a portfolio is made up of 40% Security A and 60% Security B. What is the expected return, standard deviation and coefficient variation of the portfolio? (6) 6.5. Which security should be selected, Security A, Security B or the portfolio? Explain (3)