In a mathematics test, the following marks were obtained by 40 students. Arrange these marks in a table using tally marks.
| 8 |
1 |
3 |
7 |
6 |
5 |
4 |
4 |
2 |
4 |
9 |
5 |
3 |
| 7 |
1 |
6 |
5 |
2 |
7 |
7 |
3 |
8 |
4 |
2 |
8 |
9
|
| 5 |
8 |
6 |
7 |
4 |
5 |
6 |
9 |
6 |
4 |
4 |
6 |
6 |
(a) Find how many students obtained marks equal to or more than 7?
(b) How many students obtained marks below 4?
