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# Statistics: Probability and Statistics Functions Calculator

## This calculator focuses on probability and statistic functions.

Using the "long press" gesture will display a hint about any key. (Video: Displaying a hint) You can inspect the Key Details to see the formulas and functions for any key. Label Description
nrms Calculates the standard normal cumulative distribution for x.
nrm 1 Calculates the cumulative distribution function for z=value, y=μ, x=σ, 1 tail.
nPr Calculates the number of ordered ways that x objects can be chosen from a set of y objects.
x! Calculates the factorial of x.
Γ Calculates the value the Gamma function for x.
Calculates the square root of x.
y^x Calculates y raised to power of x.
1/x Calculates the reciprocal of x.
SWAP Swaps the x and y registers.
÷ Divides y by x.
ROLL Rolls the stack down.
× Multiplies y times x.
Subtracts x from y.
% Calculates the x percent of y.

Label Description
nrms⁻¹ Calculates the inverse of the standard normal cumulative distribution for x.
nrm⁻¹ Calculates the inverse of the cumulative normal distribution function, for z=value, y=μ, x=σ.
nCr Calculates the number of ways that x objects can be chosen from a set of y objects.
n!! Calculates the double factorial of x.
ln Γ Calculates the natural logarithm of the gamma function for x.
nrm Calculates the probability density function of the normal distribution for z=value, y=μ, x=σ
rand Calculates a random number greater than or equal to 0 and less than 1.
randBt Calculates a random number greater than or equal to y and less than x.
srand Enters a seed for the random number generator using the integer value of x. Use x = 0 for a system generated seed.
last x Recalls the 'last x' value.
clr m Clears all of the user memory.
clr s Clears the stack registers (x, y, z, t).
binmC Calculates the binomial cumulative distribution for z=k, y=n, x=p.
binmP Calculates the binomial probability mass for z=k, y=n, x=p.
erf y,x Calculates the error function (lower (y), upper (x)).
erf x Calculates the error function (lower 0, upper (x)).
erfc Calculates the complementary error function of x.
nrms2 Calculates the 2 tail standard normal cumulative distribution.
Δ% Calculates the percent change from y to x.