Supriya Kurian
Standard deviation
1 Answer(s)      6 years and 4 months ago
Posted in : Java Beginners

program to calculate the standard deviation of an array of values.the array elements are read from terminal.use function to calculate standard deviation and mean.

December 10, 2010 at 1:39 PM

Hi Friend,

Try the following code:

```import java.util.*;

public class StandardDeviation{
public double findMean(int array[]){
double total = 0;
for(int i = 0; i < array.length; i++){
total = total + array[i];
}
double mean = total/array.length;
return mean;
}
public void findStandardDeviation(int array[]){
double mean = findMean(array);
System.out.println("Mean is: "+mean);
double d1 = 0;
double d2 = 0;
double sum = 0;
for(int i = 0; i < array.length; i++){
d2 = (mean - array[i])*(mean - array[i]);
d1 = d2 + d1;
}
System.out.println("Standard Deviation: " + Math.sqrt((d1/(array.length-1))));
}

public static void main(String args[]){
Scanner input=new Scanner(System.in);
System.out.println("Enter Array Elements: ");
int array[] = new int[5];
for(int i=0;i<array.length;i++){
array[i]=input.nextInt();
}
StandardDeviation sd = new StandardDeviation();
sd.findStandardDeviation(array);
}
}
```

Thanks

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