Based on data from the

Statistical Abstract of the United States

, the probability that a

newborn baby will be a girl is about 0.650. Three newborns are selected at random.

a) Use the tree diagram to list the outcomes. From the tree diagram, find the probability in

which at least one of the three babies are girls

b) Using the binomial probability formula, obtain the probability in which at least

two of the three babies are girls.

Please show all of your work I am very confused