Open In App
Related Articles

Standard Normal Distribution (SND) – Java Program

Improve
Improve
Improve
Like Article
Like
Save Article
Save
Report issue
Report
The standard normal distribution is a special case of the normal distribution. It occurs when a normal random variable has a mean of 0 and a standard deviation of 1. The normal random variable of a standard normal distribution is called a standard score or a z score. A conversion from Normally distributed to Standard Normally distributed value occurs via the formula,
Z = (X - u) / s
where:
Z = value on the standard normal distribution
X = value on the original distribution
u = mean of the original distribution
s = standard deviation of the original distribution
Code –
// Java code to demonstrate the naive method
// of finding Z-value
  
import java.io.*;
import java.util.*;
  
class SDN {
    public static void main(String[] args)
    {
  
        // initialization of variables
        double Z, X, s, u;
        X = 26;
        u = 50;
        s = 10;
  
        // master formula
        Z = (X - u) / s;
  
        // print the z-value
        System.out.println("the Z-value obtained is: " + Z);
    }
}

                    
Output –
the Z-value obtained is: -2.4

Generating a Random Standard Normal Function – Using nextGaussian() in Java : The nextGaussian() method is used to get the next random, Normally distributed double value with mean 0.0 and standard deviation 1.0.
Declaration :
public double nextGaussian()
Parameters :
NA
Return Value :
The method call returns the random, Normally distributed double value
with mean 0.0 and standard deviation 1.0.
Exception :
NA
The following example shows the usage of java.util.Random.nextGaussian(): Code –
// Java code to demonstrate the working
// of nextGaussian()
import java.util.*;
  
public class NextGaussian {
  
    public static void main(String[] args)
    {
  
        // create random object
        Random ran = new Random();
  
        // generating integer
        double nxt = ran.nextGaussian();
  
        // Printing the random Number
        System.out.println("The next Gaussian value generated is : " + nxt);
    }
}

                    
Output –
The next Gaussian value generated is : -0.24283691098606316


Last Updated : 06 Feb, 2018
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads