Question

Find the Standard Deviation in Java: Use Arrays and Looping. Calculate the Standard Deviation once you have the m numbers in an Array of size m. *Don't use different methods

Answer 1

import java.util.Scanner;

public class TestCode {
    public static void main(String args[]){
        int n;
        Scanner scanner = new Scanner(System.in);
        System.out.print("How many input numbers: ");
        n = scanner.nextInt();

        double arr[] =  new double[n];
        System.out.print("Enter "+ n +" numbers: ");
        for(int i = 0;i<n;i++){
            arr[i] = scanner.nextDouble();
        }

        double sum = 0;
        for(int i = 0;i<n;i++){
            sum += arr[i];
        }
        double mean = sum/n;

        double res = 0;
        for(int i = 0;i<n;i++){
            res += Math.pow(arr[i]-mean,2);
        }
        res = (float) Math.sqrt(res/ (n-1));
        System.out.println("Standard deviation: "+ res);
    }
}