Question:

A math class instructor wants to implement a method called findAverage in their Math class to calculate the average of a list of numbers. The method should take in a list of integers as a parameter and return the average of the numbers in the list as a floating-point number.

Write the code for the findAverage method in the Math class using an intermediate level coding techniques in Java. Make sure to include the method signature.

Math.java

public class Math {
    // Write the findAverage method here
}

Answer:

Math.java

public class Math {
    public static double findAverage(int[] numbers) {
        int sum = 0;
        for (int number : numbers) {
            sum += number;
        }
        return (double) sum / numbers.length;
    }
}

Explanation:

The method findAverage takes an array of integers numbers as a parameter and calculates the sum of all the numbers in the array using a for-each loop. It initializes a variable sum to 0 and iterates over each element number in the numbers array, adding it to the sum.

After calculating the sum, it returns the average of the numbers by dividing the sum by the length of the numbers array, casting the result to a double to obtain the desired floating-point representation of the average.

For example, if we have the array [2, 4, 6, 8, 10], the sum would be 2 + 4 + 6 + 8 + 10 = 30, and the average would be 30 / 5 = 6.0.