7. An investor has OMR 75,000 to invest in shares of Lays or Waves. The expected returns and standard deviations of which are as follows. The correlation coefficient between those two shares is -0.4. R o Lays 11.5 3.5 Waves 20.5 10.5 Required a. Calculate the portfolio expected returns and standard deviations for the following allocations. Portfolio Waves (%) Lays (%) A 75 25 B 50 50 25 75 b. Calculate the minimum standard deviation available by varying the proportion of Lays and Waves shares in the portfolio