this is a probability question

QUESTION 2 [15 MARKS] Data for Test 1 (x) and Test 2 (y) marks for 9 students were collected as shown in Table 2. a) b) Table 2 x y 77 82 50 66 7 1 78 72 34 8 1 4'? 94 85 96 99 99 99 67 68 Estimate the linear regression Iine ( j? : b\" + bix) using the least square method. (13 marks) Estimate the Test 2 marks of a student who received a mark 85 on the Test 1. (2 marks)