A particle dispersoid has $1510$ spherical particles of uniform density. An air purifier is proposed to be used to remove these particles. The diameter specific number of particles in the dispersoid, along with the number removal efficiency of the proposed purifier is shown in the following table:
$$\begin{array}{|l|l|l|} \hline \text{Diameter of the} & \text{Number of particles} & \text{Number removal} \\ \text{particle} (\mu \mathrm{m}) && \text{efficiency} (\%) \\
\hline 1 & 1000 & 99 \\ \hline 10 & 500 & 75 \\ \hline 100 & 10 & 10 \\ \hline \end{array}$$
The overall mass removal efficiency of the proposed purifier is $\_\_\_\_\_ \: \%$. (rounded off to one decimal place)
