Calculating Variance of Study Hours

In a recent analysis of the weekly study hours of 30 students, the following data points were collected:

5, 7, 8, 9, 10, 10, 11, 12, 12, 13, 14, 15, 15, 15, 16, 16, 17, 18, 19, 20, 20, 20, 21, 22, 22, 23, 24, 25, 26, 30.

You are required to compute the variance of this dataset. Recall that variance is calculated using the formula:

$$ ext{Variance} =\frac{ ext{Sum of squares of deviations from the mean}}{N}$$