**Probability and Tree Diagrams**

Carol is one of three female triplets. Carol believes it is unlikely that a mother of triplets would have three girls. She feels that it would be more likely for a mother to have different genders, like two girls and a boy or two boys and a girl, rather than having all three babies be the same gender. After surveying several mothers, she begins to wonder what the *theoretical probability* is of having three females in one birth. She makes a *tree diagram* to answer this question. A tree diagram shows all the possible outcomes in a probability situation.

**Theoretical probability**: the probability that a certain outcome will occur

Go to the following page and click the Play button to begin the interactive about tree diagrams.