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A sample of $50$ pieces of pears was selected randomly from the production of the plant breeding institute. The weights of these pears are recorded in the table. $$\begin{array}{|cc|}\hline \text{ Weight (g) }& \text{ Number of pears }\\ 26\text{ -- }30& 8\\ 31\text{ -- }35& 14\\ 36\text{ -- }40& 15\\ 41\text{ -- }45& 9\\ 46\text{ -- }50& 4\\ \hline\end{array}$$ Calculate the variance of pear weights and round the variance to the nearest hundredth. (To solve the task with help of calculator is recommended.)