$7\mathrm{.}29$ The time factor for a clay layer undergoing consolidation is $0\mathrm{.}20.$ What is the degree of consolidation $($consolidation ratio$)$ at the center and at the quarter points $($that is$,\frac{z}{H}=0\mathrm{.}25$ and $0\mathrm{.}75)?$ What is the average degree of consolidation for the layer?

$7\mathrm{.}30$ If the final consolidation settlement for the clay layer of Problem $7\mathrm{.}291$ is expected to be $3\mathrm{.}7ft,$ how much settlement has occurred when the time factor is $($a$)0\mathrm{.}35$ and $($b$)0\mathrm{.}75?$

Please solve $7\mathrm{.}30$