The mode of the following data $120,110,130,110,120,140,130,120,140,120\text{, }$ is

The frequency table for the given data is as given below: 

$\begin{array}{lcccc}\text{ Value }\left(x_i\right):& 110& 120& 130& 140\\ \text{ Frequency }\left(f_i\right):& 2& 4& 2& 2\end{array}$

We observe that the value 120 has the maximum frequency. Hence, the mode or modal value is 120.