Given the following information for a split spoon sample, what $is$ the standard penetration number corrected for field conditions $(N60)?$ Round $to$ the nearest whole number. Given the following information for a split spoon sample, what is the standard penetration number corrected for field conditions $(N_{60})?$ Round to the nearest

whole number.

Consecutive blow counts of $5,7,$ and $8$

US safety hammer on a rope and pulley

Boring diameter of $8-$inches

Standard sampler

Sample depth at $15$ feet

$7$

$9$

$12$

$15$

Consecutive blow counts $of5,7,$ and $8$

$US$ safety hammer $on$ a rope and pulley

Boring diameter $of8-$inches

Standard sampler

Sample depth $at15$ feet