$($b$)$ At a given site, a boring with SPT was carried out up to $15\mathrm{.}0m$ depth. The results of the boring are as given in the table below: $($SPT specification: Safety Hammer, Borehole dia of $100mm,$ Standard Sampler$)$

$\backslash$table$[[$Depth $($m$),\backslash$table$[[$Measured $N$