Answer
$P(survived)=\frac{711}{2224}\approx0.3197$
Work Step by Step
1) a single event
2) relative frequency
Use the Empirical Approach (page 258):
The sample space: 2224 passenger. So, $N(S)=2224$
According to the marginal distribution (see page 235) of the first row: $N(survived)=711$
$P(survived)=\frac{711}{2224}\approx0.3197$