Answer
$P(3000~to~3999~grams)=\frac{2,825,549}{4,305,340}=0.6563$
Work Step by Step
The sample space: $4,305,340$ babies born in 2007. So, $N(S)=4,305,340$
According to the marginal distribution (see page 235) of the fourth row: $N(3000~to~3999~grams)=2,825,549$
Using the Empirical Approach (page 258):
$P(3000~to~3999~grams)=\frac{N(3000~to~3999~grams)}{N(S)}=\frac{2,825,549}{4,305,340}=0.6563$
