Given, The data is given in table

To Find: Find the mean and, the variance of the frequency

Explanation: Here, the class interval is not continues frequency distribution, So we have to convert into continues frequency distribution by subtracting 0.5 from the lower limit and adding 0.5 to the upper limit then we get,

Now, N=16, ,

Mean

Variance = 3.74

Hence, The variance is 3.74