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A sample of 10 students was taken from a history class. The data below are the final exam scores and the number of hours they studied before the exam. The least-squares regression line is given to be v - 4.82x + 56.56 Hours, x 3 5 2 7 2 4 4 5 8 3 Score, y 65 80 60 88 66 78 85 90 90 71 Predict the final exam score for a student who studied 4 hours. O 78 O 85 O 75.84 O 81.5