- #1
Roni1985
- 201
- 0
Homework Statement
I'm not sure if this is the exact wording, but here it is:
Let's assume a family wants at least 1 girl and 1 boy. It stops having kids once it get both.
Ex:
BBBBBG
GB
GGGGGGGGGB
etc.
What is the expect number of kids in the family?
Homework Equations
Is this a geometric random variable?
The Attempt at a Solution
I attempted to find the expected value by using a sum.
I can find the sum of the probabilities and I'm getting 1, but can't seem to find the expected value.
inf
[tex]\sum n(\frac{1}{2})^n [/tex]
n=2