A $2-$ft long split spoon sampler was hammered into the ground using a $140$ lb hammer

with a drop height of $30$ inches for the purpose of the SPT test and sampling. The

recorded blow counts per $6$ inches from a depth of $10-12$ feet were $15-18-11-16.$

What is the $($uncorrected$)$ N $-$value from this data?

$29$ blows$/$ft

$33$ blows$/$ft

$60$ blows$/$ft

$27$ blows$/$ft