Answer
$P(E^c)=\frac{23,905}{33,722}\approx0.7089$
Work Step by Step
The event $E^c$ = "not alcohol related" is the complement of "alcohol related".
Using the Complement Rule (see page 275):
$P(E^c)=1-P(E)=1-\frac{9817}{33,722}=\frac{33,722}{33,722}-\frac{9817}{33,722}=\frac{23,905}{33,722}\approx0.7089$
