# Distribution - HP 39gII User Manual

Graphing calculator.

i
MAXREAL
MINREAL
π

## Distribution

normald
normald_cdf
162
Imaginary value for
i
Maximum real number. Internally represented as
9.99999999999 x 10
MAXREAL
Minimum real number. Internally represented as
-499
1x10
.
MINREAL
Internally represented as 3.14159265359.
π
This category contains probability density functions, and
both cumulative probability functions and their inverses,
for the common probability distributions. These
distributions include the Normal, Binomial, Chi-square,
Fisher, Poisson, and Student's t distributions.
Normal probability density function. Computes the
probability density at the value x, given the mean, μ and
standard deviation, σ of a normal distribution. If only a
single value (x) is supplied, assumes μ=0 and σ=1.
normald([μ, σ,] x)
Example:
normald(0.5) and normald(0, 1, 0.5) both return
0.352065326765.
Cumulative normal distribution function. Returns the
lower-tail probability of the normal probability density
function for the value x, given the mean, μ and standard
deviation, σ of a normal distribution. If only a single value
(x) is supplied, assumes μ=0 and σ=1.
normald_cdf([μ, σ,] x)
Example:
normald_cdf(0, 1, 2) returns 0.97724986805.
, the complex number (0,1).
1 –
499
.
Using mathematical functions  