Answer :

Given:


Mean=4


Variance=2


P(x=1)=?


P(x=r)= nCr pr qn-r


P(x=1)= nC1 pqn-1


= npqn-1


np(1-p)=2


4(1-p)=2



=q



np=4


n=8


P(x=1)



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