Answer
$P\left( 9 \right)=89$
Work Step by Step
Substitute $x=9$,
$\begin{align}
& P\left( 9 \right)=\frac{100\left( 9-1 \right)}{10} \\
& =89
\end{align}$
Thus, given a disease that smokers are 9 times more likely to die from than non-smokers, we see that 89% of deaths are related to smoking.
