The teachers’ library›Probability and statisticsProbability of an eventP(A)=n(S)n(A)P(A)=n(A)n(S)0≤P(A)≤10≤P(A)≤1P(A′)=1−P(A)P(A′)=1−P(A)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 theoremAddition and multiplication rulesBinomial distributionExpected value and varianceMean, standard deviation and z-score