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Saved Here are returns and standard deviations for four investments Return Standard Deviation (X) Treasury bilis Stock P Stock Stock 6.9 10.5 SK 18.0 10 26 25 21.0 + xes Calculate the standard deviations of the following portfolios a. 50% in Treasury bills, 50% in stock P. (Enter your answer as a percent rounded to 2 decimal places.) Standard deviation % b. 50% each in Q and R, assuming the shares have: (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) Perfect positive correlation Perfect negative correlation No correlation Standard Deviation % % %