diff --git a/Week02/weighted_Yagiz_Cengiz.py b/Week02/weighted_Yagiz_Cengiz.py
new file mode 100644
index 00000000..c5b4247f
--- /dev/null
+++ b/Week02/weighted_Yagiz_Cengiz.py
@@ -0,0 +1,7 @@
+import random
+
+def weighted_srs(data, n, weights, with_replacement=False):
+    use_choices = bool(with_replacement or weights)
+    if use_choices:
+        return random.choices(data, weights=weights, k=n)
+    return random.sample(data, n)
diff --git a/Week03/shifted_Yagiz_Cengiz.py b/Week03/shifted_Yagiz_Cengiz.py
new file mode 100644
index 00000000..c4484044
--- /dev/null
+++ b/Week03/shifted_Yagiz_Cengiz.py
@@ -0,0 +1,6 @@
+def shifted(data):
+    if not data: return 0
+    n, s = len(data), sorted(data)
+    mean = sum(data) / n
+    median = s[n // 2] if n % 2 != 0 else (s[n // 2 - 1] + s[n // 2]) / 2
+    return (abs(mean - median) / abs(mean)) * 100 if mean != 0 else 0