A soil will be produced by mixing $25\%$ by mass of soil A with $75\%$ by mass of soil $B.$

The Hydrometer data for the soil mixture is shown below.

a$)$ Plot the particle$-$size distribution of the soil.

b$)$ Determine $D_{60},D_{30},$ and $D_{10}$ for the soil mixture.

c$)$ Determine the coefficient of uniformity and coefficient of curvature.