The grades of a class of 9 students on a midterm report (x) and on the final examination (y) are shown below. Use the data to complete parts (a) and (b). X 78 45 72 71 82 93 95 99 69 0 y 83 60 79 36 49 83 99 99 70 (a) Estimate the linear regression line. y = 12.6 + (0.773 ) x (Round the constant to one decimal place as needed. Round the coefficient to three decimal places as needed.) (b) Estimate the final examination grade of a student who received a grade of 87 on the midterm report. y =(Round to one decimal place as needed.)