Can you help me complete the Tester? import java.lang.Math; public class P6_2{ i

Question

Can you help me complete the Tester?

import java.lang.Math;

public class P6_2{
int count ;
double sum;
double sumSquares ;
  
public P6_2(){
this.count = 0;
this.sum = 0;
this.sumSquares = 0 ;
}
  
public void add (double num){
sum = sum +num;
sumSquares = sumSquares + num * num;
count ++;
}
  
public double getAverage(){
return sum / count;
}
  
public int getCount(){
return count;
}
  
public double getStandardDeviation(){
return Math.sqrt((sumSquares - Math.pow(sum,2)/count)/(count-1));
}
  

}

import java.util.Scanner;
public class P6_2Tester{
public static void main(String[] args){
P6_2 a =new P6_2();
Scanner in = new Scanner(System.in);
System.out.println("Please enter numbers: ");
double num = in.nextDouble();
  
a.add(num);
System.out.println("Total counts are " + a.getCount());
System.out.println("The average is " + a.getAverage());
System.out.println("Standard Deviation is " + a.getStandardDeviation());
  
in.close();
}
}

Explanation / Answer

Hi i make change to program and run it please follow the below output:

program:

import java.lang.Math;
import java.util.Scanner;
class P6_2{
int count ;
double sum;
double sumSquares ;
  
public P6_2(){
this.count = 0;
this.sum = 0;
this.sumSquares = 0 ;
}
  
public void add (double num){
sum = sum +num;
sumSquares = sumSquares + num * num;
count ++;
}
  
public double getAverage(){
return sum / count;
}
  
public int getCount(){
return count;
}
  
public double getStandardDeviation(){
return Math.sqrt((sumSquares - Math.pow(sum,2)/count)/(count-1));
}
  
}

class P6_2Tester{
public static void main(String[] args){
P6_2 a =new P6_2();
Scanner in = new Scanner(System.in);
System.out.println("Please enter numbers: ");
double num = in.nextDouble();
  
a.add(num);
System.out.println("Total counts are " + a.getCount());
System.out.println("The average is " + a.getAverage());
System.out.println("Standard Deviation is " + a.getStandardDeviation());
  
in.close();
}
}

output:

input 34

output:

Success time: 0.07 memory: 4386816 signal:0

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