Normal Approximation Calculator

Integer 0≤k≤n; approximation for np≥10 and n(1−p)≥10.

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Normal approximation meann*p

Normal approximation SDsqrt(n*p*(1-p))

Continuity-corrected P(X≤k)(1+erf((k+0.5-n*p)/sqrt(2*n*p*(1-p))))/2