The decision variables $of$ a model are also known $as$ the

environmental factors

projected results

uncontrollable output

controllable inputs

When the exponential distribution probability $is$ given $asP(x9)=1-e^{-\frac{9}{18}}$ the average value for $xis$

$\frac{1}{2}$

$18$

$\frac{9}{18}$

$9$