5 Mr. Gerrard is Considering investing in the two sercurities whose details are shown below: Security A B Return on Probability 0.25 0.75 Returns on Security A (%) Security B (%) 4 7 1016 7 Mr Gerrard would when want to invest N$ 3500000 in Sercurity A and N$ 4500 000 in sexcurity B. However he is Str surt about the amount of risk he is taking and would want you Required to assist returs and standard 5. Calculate the expected. deviation of the two securities S Calculate the standard deviation of the portfolio. of asset A and B