Question

Create a java program MyGrader that prompts the user for a series of grades between 0 .. 100. A -1 grade is the end
of input sentinel. There can be a maximum of 100 grades. find sum and average and standard deviation (USe arrays and loops for solving this problem)

Answer 1

import java.util.Scanner; 1 2 3 4public class MyClass { public static void main (String args[) { Scanner sc = new Scanner(System.in); int[] grades int index -0, total = 0; double avg = 5- 6 new int[100]; 7 , sd 10 System.out.println("Enter grades -1 to stop):"); int number = sc.nextInt ); while(number = -1) 11 12 13 14 grades[index++] = number; total +number; number sc.nextInt) 15 16 17 18 19 avg total index; 20 21 for(int g: grades) 22 23 sd (avg-g)* (avg-g) } 24 25 26 Math.sqrt(sd) 27 sd 28 = " total) avg) System.out.println("Sum System.out.println("Average = System.out.println("Standard deviation 29 30 sd); 32 33 34 m m m m

Enter grades (-1 to stop): 10 20 30 40 50 60 70 80 90 100 -1 Sum 550 Average 55.0 Standard deviation = 529.6225070746144

import java.util.Scanner;

public class MyClass {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
int[] grades = new int[100];
int index = 0, total = 0;
double avg = 0, sd = 0;
  
System.out.println("Enter grades (-1 to stop):");
int number = sc.nextInt();
while(number != -1)
{
grades[index++] = number;
total += number;
number = sc.nextInt();
}
  
avg = total / index;
  
for(int g: grades)
{
sd += (avg-g)*(avg-g);
}
  
sd = Math.sqrt(sd);
  
System.out.println("Sum = " + total);
System.out.println("Average = " + avg);
System.out.println("Standard deviation = " + sd);
  
}
}