A laboratory oedometer $($consolidation$)$ test is carried out on a sample taken from a clay layer. The lab data is given in the table below: $($Answer on this page$)(10$ p$)$

a$)$ determine pre$-$consolidation pressure $({}_n^{\text{'}})$ using method $B.(2$p$)$

b$)$ calculate compression index $($Ce$).(4$p$)$

c$)$ calculate $m_v$ for $=500$ and $1000$kPa. $(4$p$)$

$\backslash$table$[[{}^{\text{'}}(kPa),e$