2.5 Standard Deviation and Correlation Between 1999 and 2002, the shares of SKF and Volvo had the following return per year: 1999 2000 2001 2002 SKF -12 % -5% 23% 2% Volvo -15 % 11% 34% .6 % Use this information to estimate a) The standard deviation of the SKF share b) The correlation coefficient between the SKF and Volvo shares