How to use Find Binomial Probability on the TI 83 (BinomCDF)

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The TI 83 BinomPDF and TI 83 BinomCDF functions can assist you in solving binomial probability questions in seconds. The difference between the two functions is that one (BinomPDF) is for a single number (for example, three tosses of a coin), while the other (BinomCDF) is a cumulative probability (for example, 0 to 3 tosses of a coin). This article covers BinomCDF. For single number probabilities (like two, or three, or a dozen, or something similar, you’ll want to check out this other article on TI 83 BinomPDF).

Sample problem: Bob’s batting average is .321. If he steps up to the plate four times, find the probability that he gets up to three hits.

Step 1: Press 2nd VARS to get the “DISTR” option. Scroll down to “A:BinomCDF” and then press ENTER.

Step 2: Enter the number of trials. Bob bats four times, so the number of trials is 4. Press 4 followed by ,.

Step 3: Enter the Probability of Success, P. Bob has a batting average of .321, so enter . 3 2 1, then press ,.

Step 4: Enter the X value. We want to know what the probability is that Bob will get up to three hits, so enter 3 and then press ).

Step 5: Press Enter for the result. Bob’s chances of getting up to three hits is .989.

Tip: Instead of scrolling down to “A:BinomCDF” you can press Alpha MATH.

Related posts:

  1. How to use Find Binomial Probability on the TI 83 (BinomPDF)
  2. How to use the BinomialCdf function on the TI-89 to find Binomial Probability.
  3. How to Calculate Binomial Probability on the TI-89 Graphing Calculator
  4. How to Get The Mean and Standard Deviation For a Binomial Probability Distribution With a TI 83 Calculator
  5. How to find the mean: probability distribution or binomial distribution
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One Response to “How to use Find Binomial Probability on the TI 83 (BinomCDF)”

  1. Statistics How To» Blog Archive » How to use Find Binomial Probability on the TI 83 (BinomPDF) said:

    Mar 30, 10 at 10:14 am

    [...] The TI-83 and higher calculators are equipped with two functions: BinomPDF and BinomCDF to help you make light work of figuring our binomial probabilities. While figuring out binomial distributions by hand can involve multiple equations and lots of time (especially if you are working with cumulative probabilities), entering a binomial probability into the TI 83 is no harder and entering an addition problem into the home screen. This article tells you how to use the BinomPDF function to figure out an exact quantity (like three times, or twice, or a dozen occurrences). For cumulative probabilities (like “up to a certain number” or “between 5 and 10″ or “under 6″ or something similar, you’ll want to check out this other article on TI 83 BinomCDF. [...]

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