Question

Exercise 03: Write a program in java that read as input the scores of 3 quizzes of each student (out of 10 as follows) into a 2-D array: Enter the number of students> 4 Enter quiz scores for student 1> 10.0 2.04.0 Enter quiz scores for student 2> 5.5 6.0 6.0 Enter quiz scores for student 3» 8.259.04.0 Enter quiz scores for student 4> 9.5 8.5 2.0 The program then calculates the average of each quiz score for all the students. It then computes a 'grand' average by computing the 'average of averages' The program then decides if a student is 'Above Average' or 'Below Average' as follows: If the majority of student's scores are-Grand Average, then thouit le ts elioes eelse the stuso average. Your output Grand Average is 6.229/10.e Student 1 is Below Average Student 2 is Below Average Student 3 is Above Average Student 4 is Above Average

Answer 1

import java.util.*;

class QuizScores
{
public static void main (String[] args)
{
  Scanner input = new Scanner(System.in);
  
  System.out.println("Enter the number of students> ");
  int num = input.nextInt();
  double avg = 0.0;// initialize grand average
  
  double[][] score = new double[num][3];
  double[] average = new double[num];// average of num students
  
  
  for(int i=0;i<num;i++)
  {
   average[i] = 0.0;
   System.out.println("Enter quiz score for student "+(i+1));
   for(int j=0;j<3;j++)
   {
    score[i][j] = input.nextDouble();// input score
    avg += score[i][j];// grand average
    average[i] += score[i][j];
   
   }
   average[i] /= 3;// compute average of student i
  }
  
  avg = avg/(num*3);
  System.out.printf("Grand Average is %.3f",avg);
  
  for(int i=0;i<num;i++)
  {
   // compare grand average with each student average
   if(average[i] < avg)
   System.out.println("\nStudent "+(i+1)+" is below average ");
   else if(average[i] > avg)
   System.out.println("\nStudent "+(i+1)+" is above average ");
  }
}
}

Output:

Enter the number of students>4
Enter quiz score for student 1   10.0 2.0 4.0
Enter quiz score for student 2 5.5 6.0 6.0
Enter quiz score for student 3   8.25 9.0 4.0
Enter quiz score for student 4 9.5 8.5 2.0
Grand Average is 6.229
Student 1 is below average

Student 2 is below average

Student 3 is above average

Student 4 is above average

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