HP 39gII

162 Using mathematical functions
i Imaginary value for , the complex number (0,1).
i
MAXREAL Maximum real number. Internally represented as
9.99999999999 x 10
499
.
MAXREAL
MINREAL Minimum real number. Internally represented as
1x10
-499
.
MINREAL
π Internally represented as 3.14159265359.
π
Distribution
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.
normald 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.
normald_cdf 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.
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