A standard penetration test $($SPT$)$ data automatic hammer with an efficiency of $80\%$ produced $12,9,12,$ blows for each $6-$inch interval from $20$ to $21\mathrm{.}5$ feet. Assume that the automatic hammer operates at an $80\%$ efficiency and that a standard sampler was used. The soil was visually classified as a silty fine sand. The borehole diameter is $100$ mm $($i$.$e$.,4-$inches$),$ and a standard sampler was used. Round your answer to the nearest whole number.a$.$ Determine the SPT N value based on this datab. Determine the field corrected standard penetration numbers N$60$c$.$ Determine Nes according to the Florida Department of Transportation guidelines.