TI-BASIC:Normalpdf
Command Summary
Evaluates the normal probability density function at a point.
Command Syntax
normalpdf(x[,μ, σ])
Menu Location
Press:
- 2ND DISTR to access the distribution menu
- ENTER to select normalpdf(.
TI-83/84/+/SE
2 bytes
normalpdf( is the normal (Gaussian) probability density function.
Since the normal distribution is continuous, the value of normalpdf( doesn't represent an actual probability - in fact, one of the only uses for this command is to draw a graph of the normal curve. You could also use it for various calculus purposes, such as finding inflection points.
The command can be used in two ways: normalpdf(x) will evaluate the standard normal p.d.f. (with mean at 0 and a standard deviation of 1) at x, and normalpdf(x,μ,σ) will work for an arbitrary normal curve, with mean μ and standard deviation σ.
Formulas
For the standard normal distribution, normalpdf(x) is defined as Template:TI-BASIC:Math \, e^{-\frac1{2}x^2} }}
For other normal distributions, normalpdf( is defined in terms of the standard distribution: Template:TI-BASIC:Math
