Consider the soil whose PSD curve is shown in the figure below. The soil has PL $=25\%$ and $LL=75\%.$ Answer the questions below. You may refer to the attached USCS table where necessary.

$($a$)$ What is the fines content of the soil?

$[1]$

$($b$)$ According to the USCS, is the soil coarse$-$grained or fine$-$grained?

$[1]$

$($c$)$ What is the plasticity index of the soil?

$[1]$

$($d$)$ Calculate $D_{60},D_{30},$ and $D_{10}.$

$[2]$

$($e$)$ Compute the coefficient of uniformity $(Cu)$ and the coefficient of curvature $(Cc).$

$[2]$

$($f$)$ In the plasticity chart, do the Atterberg limits of this soil plot above or below the A$-$line? Justify your answer.

$[2]$

$($g$)$ Classify the soil according to the USCS. Clearly explain each step of the classification process until you arrive at the group symbol$($s$).$

$[5]$