In a monthly test, the marks obtained in Mathematics by 16 students of a class are as follows :

0, 0, 2, 2, 3, 3, 3, 4, 5, 5, 5, 5, 6, 6, 7, 8

The arithmetic mean of the marks obtained is :

1. 3

2. 4

3. 5

4. 6

By formula,

$\text{Arithmetic mean} = \dfrac{\text{ Sum of all marks}}{\text{ Number of students}} \\[1em] = \dfrac{0 + 0 + 2 + 2 + 3 + 3 + 3 + 4 + 5 + 5 + 5 + 5 + 6 + 6 + 7 + 8}{16} \\[1em] = \dfrac{64}{16} \\[1em] = 4.$

Hence, option 2 is the correct option.