Answer
$P(2)=\frac{155}{297}\approx0.5219$
Work Step by Step
The sample space: 297 individuals. So, $N(S)=297$
According to the marginal distribution (see page 235) of the third column: $N(2)=155$
Using the Empirical Approach (page 258):
$P(2)=\frac{N(2)}{N(S)}=\frac{155}{297}\approx0.5219$
