add average

Maths/Average.java

@@ -0,0 +1,26 @@
+package Maths;
+
+/**
+ * Calculate average of a list  of numbers
+ */
+public class Average {
+    public static void main(String[] args) {
+        assert average(new double[]{3, 6, 9, 12, 15, 18, 21}) == 12;
+        assert average(new double[]{5, 10, 15, 20, 25, 30, 35}) == 20;
+        assert average(new double[]{1, 2, 3, 4, 5, 6, 7, 8}) == 4.5;
+    }
+
+    /**
+     * Calculate average of a list  of numbers
+     *
+     * @param numbers array to store numbers
+     * @return mean of given numbers
+     */
+    public static double average(double[] numbers) {
+        double sum = 0;
+        for (double number : numbers) {
+            sum += number;
+        }
+        return sum / numbers.length;
+    }
+}