The probability that a woman will give birth to a girl during any given pregnancy is 48%.

Please check answer to A.

a.) What is the probability that a couple planning to have four children will have exactly one girl?

P(x) = C(n,x) * P^x * Q^n-x

P(x) = C(4,1) * 0.48^1 * 0.52^3

P(x) = 0.27 ...(27%)

Need help with B.

b.) What is the probability that a couple planning to have five children will have at least two girls?

Do I solve this the same way as B, just changing 4 children to 5, and one girl to at least 2 girls? Which "formula" do I use and why? I'm really confused with this one.