Question IIf $($lo Marks$)$

A subgrade soit is tersed in the laboratory. A CBR tert was executed ueing a standurd piston having an troa of $3$ inches square at a constant rate of $0\mathrm{.}05$ inches per minute. The following results were elaborwiced thating

a penetration tent:

$\backslash$table$[[$Penetration $($ifi$),0\mathrm{.}05,,,,,,0\mathrm{.}4,05],[\backslash$table$[[$Load on piston$],[($ib$)]],30,\frac{0\mathrm{.}1}{120},\frac{0\mathrm{.}15}{255},\frac{0\mathrm{.}2}{330},\frac{025}{375},\frac{0\mathrm{.}3}{396},420,446],[$Stress $($psi$),,,,,,,,]]$

Calculate the CBR and the $M_4$ for the given soil

Stress $($peti$)$