Here are returns and standard deviations for four investments. Standard Return (%) Deviation (%) Treasury bills 6.0 0 Stock P 10.5 10 Stock Q 18.0 26 Stock R 21.0 25 da ey standard devieti Wing portfolios. ercent re 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.) Standard Deviation Perfect positive correlation 25.50% Perfect negative correlation % No correlation %