:6. In a certain class, midterm scores average out to 60, with an SD of 15. The scores on the final exam have the same average and SD. The correlation between the midterm scores and the final scores is equal to 0.8. The best prediction for the final score of a student whose midterm score is 90 is closest to a. 75

b. 60

c. 90

d. 78

e. 84