how to get to binompdf on ti 84

Mia Galupp

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26-03-2025

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How to Access binompdf on Your TI-84 Calculator

Finding the binompdf function on your TI-84 calculator might seem tricky at first, but it's straightforward once you know where to look. This function is crucial for calculating binomial probabilities, a cornerstone of statistics and probability. This guide will walk you through the process step-by-step.

Understanding binompdf

Before diving into the calculator steps, let's briefly understand what binompdf does. binompdf stands for binomial probability distribution function. It helps you determine the probability of getting exactly k successes in n independent trials of a binomial experiment, where the probability of success on a single trial is p.

Accessing binompdf on your TI-84

Here's how to find and use the binompdf function:

1. Turn on your calculator: Make sure your TI-84 is powered on.

2. Access the DISTR menu: Press the 2nd button (blue button) followed by the VARS button (it says DISTR above it in blue). This opens the Distribution menu, which contains various probability distribution functions.

3. Select binompdf: Use the down arrow key to scroll down until you see binompdf(. Select it by pressing ENTER.

4. Input the parameters: The calculator will display binompdf(trials,p,x). You need to enter the following parameters, separated by commas:

   • trials: This is the number of independent trials (n).
   • p: This is the probability of success on a single trial.
   • x: This is the exact number of successes you want to find the probability for (k).

5. Calculate the probability: After entering all three parameters, press ENTER. The calculator will display the probability of getting exactly x successes in n trials with probability p.

Example:

Let's say you want to find the probability of getting exactly 3 heads in 5 coin flips. The probability of getting a head in a single flip is 0.5. Here's how you'd do it:

1. Access binompdf( as described above.
2. Enter binompdf(5,0.5,3).
3. Press ENTER.

The calculator should display the probability, which is approximately 0.3125.

Troubleshooting and Tips:

• Error Messages: If you get an error message, double-check that you've entered the correct parameters. Ensure that 'p' is between 0 and 1 inclusive, and 'x' and 'n' are non-negative integers with x ≤ n.
• Using binomcdf: If you need to find the cumulative probability (the probability of getting x or fewer successes), use binomcdf( instead of binompdf(. The parameters are the same.
• Practice: The best way to master using binompdf is to practice with different problems. Try varying the number of trials, probability of success, and the number of successes.

By following these steps, you can confidently use the binompdf function on your TI-84 calculator to solve binomial probability problems. Remember to carefully input the parameters to get accurate results. Understanding the underlying statistical concepts will further enhance your ability to use this powerful tool.