Question:

In a math class, the teacher wants to use a method to calculate the average test score for the students. Create a Java method called calculateAverage that takes an array of test scores as input and returns the average score as a double. The method signature should be:

public static double calculateAverage(int[] scores)

Use the method calculateAverage in a main method to calculate and print the average of the following student test scores: 85, 92, 78, 88, and 90.

Answer:

public class MathClassMethods {
    public static double calculateAverage(int[] scores) {
        int sum = 0;
        for (int score : scores) {
            sum += score;
        }
        return (double) sum / scores.length;
    }
    
    public static void main(String[] args) {
        int[] testScores = {85, 92, 78, 88, 90};
        double averageScore = calculateAverage(testScores);
        System.out.println("The average test score is: " + averageScore);
    }
}

Explanation:

• In the calculateAverage method, we use a for-each loop to iterate through the scores array and calculate the sum of all the test scores.
• We then return the average score as a double by dividing the sum by the number of scores in the array.
• In the main method, an array testScores containing the test scores is created.
• The calculateAverage method is called with the testScores array as an argument, and the result is stored in the averageScore variable.
• Finally, the average test score is printed to the console.