The marks obtained by 40 students of class X of a certain school in Science paper consisting of 10 marks are presented in the table below. Find the mean marks obtained by the students.

Marks obtained(x_i)

5

6

7

8

9

Number of students (f_i)

4

8

14

11

3

Now,

top enclose straight x space equals fraction numerator begin display style stack sum f subscript i x subscript i with blank below and blank on top end style over denominator begin display style sum from blank to blank of end style f subscript i end fraction equals 281 over 40 equals 7.025

Hence, the mean marks obtained is 7.025.

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