Question

A couple plan to have exactly three children.
(a) Construct a tree diagram and list the sample space.
(b) Find the probability that the family has at least two girls.
hard to do a tree diagram here, but the sample space would be

BBB
BBG
BGB
BGG
.
.
.
GGG

"at least two" girls means either all girls or 2 girls and a boy.

count those cases and put over 8
Thanks Reiny, you are absolutly right.

Related Questions

Each child in a family of 3 children is going to get a pet. One wants a dog or cat, another wants a... A couple intends to have four children. Assume that having a boy and girl is equally likely event.... a couple is planning to have three children. Find the probability that the couple will have: a.) 2... For a family with 2 children, the sample space indicating boy (B) or girl (G) is BB, BG, GB, and GG....