The mean of the below-given data is ________.

Marks obtained (xi)	Number of students (fi)
10	5
20	6
30	2
40	1
50	10
60	8
70	3
80	5

Let's analyze the data:

The formula of mean : $\overline{\mathrm{x}}=\frac{\sum {\mathrm{f}}_{\mathrm{i}}{\mathrm{x}}_{\mathrm{i}}}{\sum {\mathrm{f}}_{\mathrm{i}}}$

Hence, 

$$\begin{gathered} \overline{\mathrm{x}}=\frac{1860}{40} \\ = 46.5 \end{gathered}$$

Therefore, the mean of the grouped data is 46.5.