12. In Mr. Wilcox's AP Statistics class, the correlation between the students' total scores prior to the final examination and their final exam scores is r=0.6. The pre-exam totals for all

students in the course have mean 280 and standard deviation 30. The final exam scores have mean 75 and standard deviation 8. Mr. Wilcox lost Gianna's final exam but knows that her total before the exam was 300. He decides to predict her final exam score from her pre-exam total. Find the equation for the least-squares regression line that Mr. Wilcox should use to make this prediction. y` = 30.02-0.16% 0.467.