Cumulative Probabilities and Calculator Use

Cumulative Probabilities and Calculator Use

Junior College 2

Binomial cumulative distribution function

For \(X\sim B(n,p)\),

BinomCDF

\[P(X\le x)=P(0\le X\le x)=\sum_{k=0}^{x}\binom nkp^k(1-p)^{n-k}\]

Calculator form

Before using BinomCDF on a TI-84 series graphic calculator, convert the expression to the form \(P(X\le x)\). For integers \(a,b\) between \(0\) and \(n\) inclusive, use the following identities.

1. \(P(X\le n)=1\)2. \(P(X<a)=P(X\le a-1)\)
3. \(P(X>a)=1-P(X\le a)\)4. \(P(X\ge a)=1-P(X\le a-1)\)
5. \(P(a\le X\le b)=P(X\le b)-P(X\le a-1)\)6. \(P(a<X<b)=P(X\le b-1)-P(X\le a)\)
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