Study the given table and answer the question that follows.
The table shows the marks obtained by three students: A, B and C in Mathematics, Chemistry and Physics. Maximum marks for each subject is 100.
| Student | Subject | ||
| Mathematics | Chemistry | Physics | |
| A | 80 | 74 | 72 |
| B | 82 | 79 | 70 |
| C | 77 | 71 | 73 |
What is the difference in the average marks per student in Mathematics and Physics, respectively?