Question

Dr. Maine gives a set of exams during the semester in her chemistry class. At the end of the semester, she drops each of student’s lowest test score before averaging the scores. She has asked you to write a program that will read a student’s test scores as input and calculate the average with the lowest dropped. She also wants you to create another program that accepts the adjusted Average and returns the course grade.

The following pseudocode shows the steps for calculating the average of a set of test scores, with the lowest score dropped:

Calculate the total of the scores

Find the lowest score

Subtract the lowest score from the total. This gives the adjusted total

Divide the adjusted total by (number of scores -1). This is the average.

You will create a class Grader.java. with:

Constructor that accepts a double array of test scores. (10 points)

The Grader class will have a method named getLowestScore that returns the lowest score in the array (10 points)

A method getAverage that returns the average of the test scores with lowest dropped (10 points)

Draw a UML diagram to show the fields, constructor, and methods (10 points)

*Please use import java.util.Scanner; and import java.util.ArrayList; if it is possible.

Answer 1

Hi Friend, Question is long, so please post in two parts.

I have answered first part: Implementation of Class and Test .

Please repost for UML diagram.

public class Grader {

   private double grades[];

   public Grader(double arr[]) {
       grades = new double[arr.length];
       for(int i=0; i<arr.length; i++)
           grades[i] = arr[i];
   }

   public double getLowestScore() {

       double min = grades[0];
       for(int i=1; i<grades.length; i++)
           if(min > grades[i])
               min = grades[i];
       return min;
   }
  
   public double getAverage() {
      
       double sum = 0;
       for(int i=1; i<grades.length; i++)
           sum += grades[i];
      
       return (sum-getLowestScore())/(grades.length-1);
      
   }
   public static void main(String[] args) {

   }

}

#############

import java.util.Scanner;

public class GraderTest {
  
   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
      
       System.out.print("how many grades want to enter: ");
       int n = sc.nextInt();
      
       double [] grades = new double[n];
       System.out.println("Enter "+n+" grades: ");
       for(int i=0; i<n; i++)
           grades[i] = sc.nextDouble();
      
       Grader obj = new Grader(grades);
      
       System.out.println("Lowest scote: "+obj.getLowestScore());
       System.out.println("Average scote: "+obj.getAverage());
   }

}

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