Texas Instruments TI-84 - Manual (Page 384)

Chapter 13: Inferential Statistics and Distributions 381
poissonpdf( poissonpdf( poissonpdf( poissonpdf(
poissonpdf( computes a probability at x for the discrete Poisson distribution with the
specified mean m, which must be a real number > 0.
x can be an integer or a list of
integers. The probability density function ( pdf ) is:
poissonpdf( m ,x)
poissoncdf( poissoncdf( poissoncdf( poissoncdf(
poissoncdf( computes a cumulative probability at x for the discrete Poisson distribution
with the specified mean m, which must be a real number > 0. x can be a real number or a
list of real numbers.
poissoncdf( m ,x)
geometpdf( geometpdf( geometpdf( geometpdf(
geometpdf( computes a probability at x , the number of the trial on which the first success
occurs, for the discrete geometric distribution with the specified probability of success p .
f x
( )
e
µ
– µ x
x!
⁄
x , 0,1,2,... = =