Suppose that the students just completing freshman year at Galton University have Math SAT scores and first-year GPAs withthe following summary statistics according to the registrar’s office. Average Math SAT score= 540 SD= 100
Average first-year GPA= 2.6 SD= 0.8
r=0.58

The scatterplot of their first-year GPAs on Math SAT scores is an oval-shaped cloud of points. Use the regression method and the r. m.s.-error to complete the sentence: The average Math SAT score among students in this group whose first-year GPA is 3.9 is estimated to be with a standard deviation of