Chapter 2, Problem 6RP

Explanation of Solution

Expressing the given vector using matrix multiplication:

Consider the following table,

Course
Student	1	2	3	4
1	3.6	3.8	2.6	3.4
2	2.7	3.1	2.9	3.6

Suppose $GPA$, denote the semester grade point average for student $i$.

The grades of first student in 4-credit courses is as follows:

$3.6+3.8=7.6$

Similarly, the grades of first student in 3-credit courses is as follows:

$2.6+3.4=6$

The grades of second student in 4-credit courses is as follows:

$2.7+3.1=5$