If the mean and variance of a binomial variate X are 2 and 1 respectively, find P(X > 1).

Given:


Mean= 2


Variance=1


P(x>1)=?


P(x>1)=1-p(x1)


= 1-[p(x=0)+p(x=1)]


=1-[ 11qn +npqn-1]


2(1-p)=1



=q



np=2


n=4




1