Use the range rule of thumb to determine whether 6 girls in 8 births is a significantly high number of girls.
Refer to the accompanying table, which describes results from groups of 8 births from 8 different sets of parents. The random variable x represents the number of girls among 8 children.
Number of Girls x P(x)
0.................................0.004
1.................................0.031
2.................................0.109
3.................................0.219
4.................................0.273
5.................................0.219
6.................................0.109
7.................................0.031
8.................................0.004