8. The closing prices for stocks ABC and XYZ last week were: Day ABC XYZ Mon 51 31 Tues 53 32.50 Weds 52.50 33 Thurs 51 31.50 Fri 53 32 a) Calculate the mean logarithmic returns for each stock, the variances, and standard deviations. (Note: The logarithmic, or continuously compounded return, is defined as Rt = In(St / St-1). ) b) Annualize the means and variances of the log returns (assume 255 trading days per year) c) Compute the volatilities. (Volatility is the annualized standard deviation of log returns.) d) What are the covariance and the correlation coefficient between ABC's and XYZ's returns