The teachers’ library›Probability and statisticsBinomial distributionP(X=k)=(nk)pk(1−p)n−kP(X=k)=(nk)pk(1−p)n−kE(X)=npE(X)=npVar(X)=np(1−p)Var(X)=np(1−p)Open on a new board The board is kept in this browser only, like your other boards. On any board, the Library button adds this too.More in Probability and statisticsPermutations and combinationsBinomial theoremProbability of an eventAddition and multiplication rulesExpected value and varianceMean, standard deviation and z-score