Answer
$P(female)=\frac{425}{2224}\approx0.1911$
Work Step by Step
1) a single event
2) relative frequency
Use the Empirical Approach (page 258):
The sample space: 2224 passengers. So, $N(S)=2224$
According to the marginal distribution (see page 235) of the second column: $N(survived)=425$
$P(female)=\frac{425}{2224}\approx0.1911$