Initial data commit

Task/Averages-Arithmetic-mean/PowerShell/averages-arithmetic-mean-1.psh

@@ -0,0 +1,11 @@
+function mean ($x) {
+    if ($x.Count -eq 0) {
+        return 0
+    } else {
+        $sum = 0
+        foreach ($i in $x) {
+            $sum += $i
+        }
+        return $sum / $x.Count
+    }
+}

Task/Averages-Arithmetic-mean/PowerShell/averages-arithmetic-mean-2.psh

@@ -0,0 +1,7 @@
+function mean ($x) {
+    if ($x.Count -eq 0) {
+        return 0
+    } else {
+        return ($x | Measure-Object -Average).Average
+    }
+}