4. Given the following data Security Number Expected Return Standard Deviation 1 2 3 4 5 6 7 15 20 18 12 10 14 16 10 15 20 10 5 10 20 What is the optimum portfolio assuming no short sales if Rp 5% and = 0.5? 4. Given the following data Security Number Expected Return Standard Deviation 1 2 3 4 5 6 7 15 20 18 12 10 14 16 10 15 20 10 5 10 20 What is the optimum portfolio assuming no short sales if Rp 5% and = 0.5