We're told that we have data that tells us the exam scored of all 346 students took a specific exam over a 10-year period. The least squares regression line for predicting final exam score from midterm exam score is y=46.6 + .41x. Octavio (what a name!) score 10 points above the class mean on the midterm, and we want to find out his predicted final exam score.

I know I need to find the predicted final score for the class mean midterm score, but I can't figure out how to do that! This is all the information I'm given.

I know that b (slope) is r(Sy/Sx), but I don't have any of these values to plug in to figure out the value of the mean midterm score.

If someone could help me out, I'd really appreciate it!