Answer:
The probability that a woman will have four girls can be calculated using the product rule, which states that the probability of multiple events occurring simultaneously is the product of the probabilities of each individual event occurring.
In this case, the probability of each child being a girl is 1/2, since there is an equal chance of having a boy or a girl. Therefore, the probability that a woman will have four girls is $(1/2)^4 = 1/16$.
It's important to note that this probability only applies if the gender of each child is independent of the others, meaning that the gender of one child does not affect the gender of the others. In reality, the probability may be slightly different due to various factors such as genetics and family history.