3.5.3.2.19 Normcdf

Description

Cmputes the probabilities of the specified tail type tail in a given value x, associated with a normal cumulative distribution.

Syntax

double prob = normcdf(double x,[int tail])

Parameters

x

Input, the value of the standard Normal variate \left[ -\infty ,+\infty \right]

tail

Input, Optional. The tail probability type using for the normal distribution
  • 1 = the upper tail probability
  • 2 = the lower tail probability (Default if not set)
  • 3 = the two tail (significance level) probability
  • 4 = the two tail (confidence interval) probability

prob

Output, the returned probability.

Example

normcdf(9.9,3)=;     // ANS: 4.1627504389865E-23