In a binomial distribution X∼Binomial(n,p)X \sim \text{Binomial}(n, p)X∼Binomial(n,p), what is the formula for the mean E[X]E[X]E[X]?
n+pn+pn+p
npnpnp
n(1−p)n(1-p)n(1−p)
np\frac{n}{p}pn