Read the question in the picture attached and kindly answer its questions.

Q4-13) answer given questions in (A,B,C).

4-13 Students in a management science class have just re- ceived their grades on the first test. The instructor has provided information about the first test grades in some previous classes, as well as the final aver- ages for the same students. Some of these grades have been sampled and are as follows: STUDENT 1 2 3 4 5 6 7 8 Ist test grade (X) 98 77 88 80 96 61 66 95 69 Final average (Y) 93 78 84 73 84 64 64 95 76 (a) Develop a regression model that could be used to predict the final average in the course based on the first test grade. (b) Predict the final average of a student who made an 83 on the first test. (c) Give the values of r and / for this model. Inter- pret the value of r in the context of this