In order for a company's employees to work for the foreign office, they must take a test in the language of the country where they plan to work. The data below show the relationship between the number of years that employees have studied a particular language and the grades they received on the proficiency exam. Use the least-squares regression line to predict $y$ given $x = 5$?
Number of years, $x$ | 3 | 4 | 4 | 5 | 3 | 6 | 2 | 7 | 3
Grades on test, $y$ | 61 | 68 | 75 | 82 | 73 | 90 | 58 | 93 | 72
79
81
83
77