Find the mean marks of the following distribution.

Marks obtained	No. of students
25	5
30	6
35	3
40	1

Correct option is C

​
Given:
Marks obtained: 25, 30, 35, 40
Number of students: 5, 6, 3, 1

Formula Used:

​$$\text{Mean} = \frac{\sum (X \times f)}{\sum f}$$​​
Where:
X = Marks obtained
f = Frequency (number of students)
Solution:
Total Marks obtained by the number of students:
25 × 5 +30 × 6 +35 × 3+40 × 1= 125 + 180 +105 + 40 = 450
Sum of frequencies (number of students): 5 + 6 + 3 + 1 = 15
Mean = $$\frac{450}{ 15}$$​ = 30