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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 76 45 73 71 81 95 97 99 69 y 81 60 77 36 48 86 99 99 70 (a) Estimate the linear regression line. y = [+()x (Round the constant to one decimal place as needed. Round the coefficient to three decimal places as needed.)