27. Calculating Descriptive Statistics Check Your Understanding Consider the following returns data for the market and XYZ, Inc. Year 1 Market 10.5% 15.6 -2.0 9.2 XYZ 6.4% 6.2 5.0 25.3 3 4. What was the average market return over this period? What was XYZ's average return? standard deviation is the appropriate measure of Because the data only covers four years of market and stock returns, the dispersion to use. XYZ's standard deviation of returns was The correlation coefficient between the returns on XYZ and the market is The beta of a regression line between XYZ and the market is