diff --git a/Week03/shifted_arda_korkmaz.py b/Week03/shifted_arda_korkmaz.py
new file mode 100644
index 00000000..f4b32066
--- /dev/null
+++ b/Week03/shifted_arda_korkmaz.py
@@ -0,0 +1,9 @@
+def shifted(data):
+    n = len(data)
+    if n == 0: return 0.0
+    mean = sum(data) / n
+    s = sorted(data)
+    mid = n // 2
+    med = (s[mid-1] + s[mid]) / 2 if n % 2 == 0 else s[mid]
+    if mean == 0: return 0.0
+    return abs((mean - med) / mean) * 100