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You are considering a security with the following possible rates of return: Probability Return % 0.20 9.6 0.30 12.0 0.30 14.4 0.20 16.8 a. b. (4 marks) (6 marks) c. Calculate the expected rate of return Calculate the standard deviation of the returns How does the standard deviation help us measure the riskiness of an investment? Define risk free rate of return. Explain the differences between systematic and unsystematic risk. (4 marks) (4 marks) d. e. (7 marks)