Question: =+b. Let x1 be the average score on the first midterm exam for the 8 a.m. students and y1 be the average score on the

=+b. Let x1 be the average score on the first midterm exam for the 8 a.m. students and y1 be the average score on the second midterm for these students.

Denote the two averages for the noon students by x2 and y2, and for the night students by x3 and y3.

Calculate r for these three (x, y) pairs.

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