HP 39gs Graphing manual Real-number functions

RANDOM	Random number (between zero and 1). Produced by a
	pseudo-random number sequence. The algorithm used in
	the RANDOM function uses a seed number to begin its
	sequence. To ensure that two calculators must produce
	different results for the RANDOM function, use the
	RANDSEED function to seed different starting values
	before using RANDOM to produce the numbers.
	RANDOM
H I N T
	The setting of Time will be different for each calculator, so
	using RANDSEED(Time) is guaranteed to produce a set of
	numbers which are as close to random as possible. You
	can set the seed using the command RANDSEED.
UTPC	Upper-Tail Chi-Squared Probability given degrees of
	freedom, evaluated at value. Returns the probability that
	a χ2 random variable is greater than value.
	UTPC(degrees, value)
UTPF	Upper-Tail Snedecor’s F Probability given numerator
	degrees of freedom and denominator degrees of freedom
	(of the F distribution), evaluated at value. Returns the
	probability that a Snedecor's F random variable is
	greater than value.
	UTPF(numerator, denominator, value)
UTPN	Upper-Tail Normal Probability given mean and variance,
	evaluated at value. Returns the probability that a normal
	random variable is greater than value for a normal
	distribution. Note: The variance is the square of the
	standard deviation.
	UTPN(mean, variance, value)
UTPT	Upper-Tail Student’s t-Probability given degrees of
	freedom, evaluated at value. Returns the probability that
	the Student's t- random variable is greater than value.
	UTPT(degrees, value)

Real-number functions

	Some real-number functions can also take complex
	arguments.
CEILING	Smallest integer greater than or equal to value.
	CEILING(value)

Using mathematical functions 13-13