The standard deviation of a portfolio: can be less than the standard deviation of the least risky security in the portfolio must be equal to or greater than the lowest standard deviation of any single security held in the portfolio can never be less than the standard deviation of the most risky security in the portfolio. is a weighted average of the standard deviations of the individual securities held in the portfolio is an arithmetic average of the standard deviations of the individual securities which comprise the portfolio estion 1 4 points Surve You would like to combine a risky stock with a beta of 1.21 with U.S. Treasury bills in such a way that the risk level of the portfolio is equivalent to the risk level of the overall market. What percentage of the portfolio should be invested in the risky stock? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, ... 3216.) Question 1 You would like to combine a risky stock with a bota of 1.21 with U.S. Treasury bills in such a way that the risk level of the portfolio is equivalent to the risk level of the overall market. What percentage of the portfolio should be invested in the risky stock? (Do not round Intermediate calculations and enter your answer as a percent rounded to 2 decimal places, ... 32.16) 82.54