Education Technology

# Knowledge Base

## Solution 27230: Performing a Poisson PDF and Poisson CDF on the TI-83 Family, TI-84 Plus Family, and TI-Nspire™ in TI-84 Plus Mode.

### How do I use the poissonpdf( or possioncdf( command on a TI-83 family, TI-84 Plus family, or TI-Nspire in TI-84 Plus mode?

The command poissonpdf( computes a probability at x for the discrete Poisson distribution with the specified mean Ã. Please note that Ã must be any real number that is greater than zero; x may be an integer or a list of integers. The syntax is as follows:

poissonpdf(Ã, x)

The command poissoncdf( computes a cumulative probability at x for the discrete Poisson distribution with a specified mean Ã. Please note that Ã must be any real number that is greater than zero; x may be any real number or a list of real numbers. The syntax is as follows:

poissoncdf(Ã, x)

Example: Given Ã=6 and x=10 find the probability for the discrete Poisson distribution:

1) Press [2nd] [DISTR].
2) On the TI-84 Plus family or TI-Nspire in TI-84 Plus mode press [ALPHA] [C]. On the TI-83 family press [ALPHA] [B].
3) Press [6] [,] [1] [0] [)] [ENTER].

Given Ã=.126 and x={0,1,2,3} find the probability for the discrete Poisson distribution:

1) Press [2nd] [DISTR].
2) On the TI-84 Plus family or TI-Nspire in TI-84 Plus mode press [ALPHA] [D]. On the TI-83 family press [ALPHA] [C].
3) Press [.] [1] [2] [6] [,]
4) Press [{] [0] [,] [1] [,] [2] [,] [3].
5) Press [}] [)] [ENTER].

Please see the TI-83 Plus Family and TI-84 Plus Family guidebooks for additional information.

TI-Nspire handheld in TI-84 Plus mode users may refer to the TI-84 Plus family guidebook.