The total mark is 72. The marks breakdown is as follows:

PS#6
10 Q1(a)
2 Q2(a)
6 Q5
3 Q6
Total: 21

PS#7
3 Q1(a)
4 Q1(b)
6 Q1(c)
4 Q2(a)
6 Q2(b)
6 Q2(c)
12 Q4
4 Q6   (bonus)
8 Q7   (bonus)
Total: 53

21+53 is 74
Questions 6 and 7 are considered bonus questions, i.e. when the total marks
are added up this assignment will be considered out of only 62.