$1-2$ In a particle size analysis experiment the following results were

obtained:

Construct differential and cumulative analysis tables from these data

and use them to determine

$($a$)$ the specific area of the material, $\frac{m^2}{k}g$

$($b$)$ the average particle population per $kg$

$($c$)$ the volume$-$surface mean diameter of the particles

Take density of the material as ${}_s=3000k\frac{g}{m^3},$ sphericity, ${}_s=0\mathrm{.}8,$

shape factor $=0\mathrm{.}95$