Answer
$P(E^c)=\frac{4}{5}=0.8$
Work Step by Step
$N(S)=5$
$N(E)=1$
Using the Classical Method (page 259):
$P(E)=\frac{N(E)}{N(S)}=\frac{1}{5}$
Now, using the Complement Rule (see page 275):
$P(E^c)=1-P(E)=1-\frac{1}{5}=\frac{5}{5}-\frac{1}{5}=\frac{4}{5}=0.8$
