Using this information, calculate the standard deviation of returns from Blue Box Crate Company's stock. 342.19% 4.30% 18.50% 34.35% Analysts and finance professionals often use the historical standard deviation to calculate estimates of the future variability. An important disclaimer in their analysis, however, always states that past performance is not a guarantee of future results. The it is important to understand that in realized rate of return (r) should not be used as the expected rate of return (r^)