Potamology is the branch of science that deals specifically with the study of surface streams, such as rivers and streams. It focuses on their physical, chemical, and biological characteristics.
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:
The overall mass removal efficiency of the proposed purifier is ________% (rounded off to one decimal place).