You can put this solution on YOUR website! if a couple plans to have 10 children whats the probability of them having at least 2 boys
---
Binomial with n = 10 and p = 1/2
----
P(2<= x <=10) = 1 - binomcdf(10,1/2,1) = 0.9893
================
Cheers,
Stan H.