Calculate the mean of the following data

Since, given data is not continuous, so we subtract 0.5 from the lower limit and add 0.5 in the upper limit of each class.

Now, we first find the class mark xi, of each class and then proceed as follows

Therefore, $\bar{x}($ mean $)=\frac{\Sigma f_{i} x_{i}}{\Sigma_{j}}=\frac{362}{28}=12.93$

Hence, mean of the given data is $12.93$.