A study was conducted to determine whether the final grade of a student in an introductory psychology course is linearly related to his or her performance on the verbal ability test administered before college entrance. The verbal scores and final grades for 10 students are shown in the table below.

Student	Verbal Score xx	Final Grade yy
11	39	69
22	47	90
33	58	60
44	79	79
55	28	76
66	64	82
77	57	82
88	62	83
99	79	62
1010	60	73

Find the following:

(a) The correlation coefficient: r=

(b) The least-squares line: y^=

(c) Calculate the residual for the eighth student: