Probability and Statistics > TI 89 for Statistics > Binomial Probability TI 89

## Binomial Probability TI 89 Overview

The **TI-89 Titanium graphing calculator** is a powerful, hand held calculator that can plot graphs, make bar graphs, and calculate just about anything related to probability and statistics. It’s possible to calculate binomial probabilities by hand, the TI-89 graphing calculator will save you about thirty minutes of time working out the problem. Once you’ve got the hang of entering the binomial **probability numbers** into the **TI-89**, you’ll wonder how you ever did without it.

**Binomial Probability TI 89 Options**: This article covers BinomialPdf, which is an exact probability for one value of x. If you want to find a cumulative probability (for example, what are John’s chances of getting 0 or 1 hits?) you will need the use the BinomialCdf function. See: What is the difference between BinomPDF and BinomCDF?

## Binomial Probability TI 89 Steps

**Sample problem: **John’s batting average is .240. If he’s at bat three times, what is the probability that he gets exactly three hits?

**Step 1:** Press the APPS key and scroll (using the scrolling arrows) to choose **Stats/List Editor**. Press ENTER.

**Step 2:** Press the F5 key. Scroll down to **B: Binomial Pdf**. Press ENTER.

**Step 3:** Enter the number of trials. John bats three times, so the number of trials is **3**. Press 3 and hit the down arrow key.

**Step 4:** Enter the Probability of Success, **P**. John’s batting average is **.240**, so enter .240. hit the down arrow key.

**Step 5:** Enter the X value. We want to know the probability of John getting exactly three hits, so type 3 in the X Value box.

**Step 6:** Press ENTER for the result. The probability of John getting exactly three hits is **.013824**, returned at the top of the screen as “**Pdf=.013824**“.

**Tip #1**: Instead of scrolling down to Binomial Pdf, you can hit the ALPHA and ( keys to select it instead.

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