The accompanying data represent the number of days absent, x, and the final exam score, y, for a sample of college students in a general education course at a large state University.

# of absences, x, 0 1 2 3 4 5 6 7 8 9

Final exam score 88.9 85.4 83.5 80.3 78.5 73.4 64.7 71.1 66.4 67.1

(a) find the least-squares regression line treating number of absences as the explanatory variable and the final exam score as the response variable.

y=[?]x+[?]

(b)Interpret the slope and the y intercept if appropriate for every additional absence, student's final exam score drops [?] points, on average. The average final exam score of students who miss no classes is [?]