# Math Help - probability

1. ## probability

A couple has six children. Assuming boys and girls are equally likely, what is the probability that they have fewer than 4 girls?

2. Originally Posted by sftball
A couple has six children. Assuming boys and girls are equally likely, what is the probability that they have fewer than 4 girls?
Let X be the random variable number of girls.

X ~ Binomial(n = 6, p = 1/2).

Calculate $Pr(X < 4) = 1 - \Pr(X \geq 4)$.

3. Thankyou...