The following CPT data is given. Plot the given data with respect to depth and

identify different soil layers. Estimate the undrained shear strength of the soil at the depth of

$4\mathrm{.}0m$ assuming the cone factor as $N_k=18.$ The soil is normally consolidated with a unit weight

of $=20k\frac{N}{m^3}$ with the water table at $3m$ depth from the ground surface.