4. Following is the information is available for company Xitang and Yiyuan, R = 17.5%, R = 27%, Ox = 11.5%, 0, = 16.5% a) What is the expected return and standard deviation for a portfolio composed of 45 per cent of Yiyuan and 55 per cent of Xitang assuming a correlation coefficient of - 0.60 between two shares? b) What will be the expected return and standard deviation for above portfolio if these two shares are perfectly negatively correlated with each other