# Physics307L F07:Schedule/Week 12 agenda/Binomial

## Binomial Distribution

$f(k;n,p)={n\choose k}p^k(1-p)^{n-k}$

### Say you are calculating the probability of having k girls in a family with n children. p is the probability of a single birth resulting in a girl. f tells you the probability of k girls.

${n\choose k}=\frac{n!}{k!(n-k)!}$