Texas Instruments TI-83 Manual Book page 272

poissoncdf(
geometpdf(
geometcdf(
13-34 Inferential Statistics and Distributions
computes a cumulative probability at x for the
poissoncdf(
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.
m
x
poissoncdf( , )
computes a probability at x, the number of the
geometpdf(
trial on which the first success occurs, for the discrete
geometric distribution with the specified probability of
success p. 0p1 must be true. x can be an integer or a list
of integers. The probability density function (pdf) is:
x
f x ( ) p ( 1 p )
p x
geometpdf( , )
computes a cumulative probability at x, the
geometcdf(
number of the trial on which the first success occurs, for
the discrete geometric distribution with the specified
probability of success p. 0p1 must be true. x can be a
real number or a list of real numbers.
p x
geometcdf( , )
1
, x 1 2 , ,