In Professor Smith's economics course the correlation between the students' total scores prior to the final examination and their final examination scores is r=.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. Professor Smith has lost Julie'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.

Use the regression line to predict Julie's final exam score.