Here is some data for two variables: "Number of Office Hours Visits" and "Score in the Class." The covariance is 6.375. The mean number of visits is five with a standard deviation of 3.54. The mean score is 87.2 with a standard deviation of 11.3. What proportion of the variability (sum of squares) in "Score" is directly attributable to the variability in "Number of Visits"? (In other words, what is the proportion of explained squared error?)

Visits Score

3 68

1 95

4 89

10 88

7 96