The marks obtained by 7 students in a group are 340, 180, 260, 164, 56, 275 and 307 respectively. Find the mean marks per student.

Marks of 7 students:

340, 180, 260, 164, 56, 275, 307

Number of students (n) = 7

Mean = $\dfrac{\text{Sum of observations}}{\text{Total number of observations}}$

Sum of observations = 340 + 180 + 260 + 164 + 56 + 275 + 307 = 1582

Total number of observations = 7

Mean = $\dfrac{ 1582}{7}$ = 226.

Hence, mean marks per student is 226.