A pension fund manager is considering three mutual funds. The first is a stock fund, the second is a long-term government and corporate bond fund, and the third is a T-bill money market fund that yieids a sure rate of 5.5%. The probability distributions of the risky funds are: The correlation between the fund returns is 0.15. Required: a. What would be the investment proportions of your portfolio if you were limited to only the stock and bond funds and the portiolio has to yleld an expected return of 12% ? b. Calculate the standard deviation of the portfolio which ylelds an expected return of 12%. (Do not round intermediate calculations. Round your answer to 2 decimal places.)