Refer to the falling$-$head permeability test data below to determine the coefficient of permeability of the soil

sample in $c\frac{m}{s}$ in scientific format; if$,$ for instance, your result is $0\mathrm{.}00021c\frac{m}{s},$ input your answer

$($without units$)$ as $2\mathrm{.}1$E$-4$