CDE

Task/Averages-Arithmetic-mean/C-sharp/averages-arithmetic-mean-1.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Linq;
+
+class Program
+{
+    static void Main()
+    {
+        Console.WriteLine(new[] { 1, 2, 3 }.Average());
+    }
+}

Task/Averages-Arithmetic-mean/C-sharp/averages-arithmetic-mean-2.cs

@@ -0,0 +1,29 @@
+using System;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        double average = 0;
+
+        double[] numArray = { 1, 2, 3, 4, 5 };
+        average = Average(numArray);
+
+        Console.WriteLine(average); // Output is 3
+
+        // Alternative use
+        average = Average(1, 2, 3, 4, 5);
+
+        Console.WriteLine(average); // Output is still 3
+        Console.ReadLine();
+    }
+
+    static double Average(params double[] nums)
+    {
+        double d = 0;
+
+        foreach (double num in nums)
+            d += num;
+        return d / nums.Length;
+    }
+}