$3-$ For a CPT test at a specific depth, if the soil material is clay, $q_t=15\mathrm{.}8$ tsf$,$ total vertical stress $=2\mathrm{.}28tsf,$ and effective vertical stress $=2\mathrm{.}28$ tsf$,$ calculate OCR, pre$-$consolidation pressure, and undrained shear strength of the clay.

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