diff --git a/Week02/weighted_kayraemre_karaosmanoglu.py b/Week02/weighted_kayraemre_karaosmanoglu.py
new file mode 100644
index 00000000..66f4147f
--- /dev/null
+++ b/Week02/weighted_kayraemre_karaosmanoglu.py
@@ -0,0 +1,9 @@
+import random
+def weighted_srs(data, n, weights, with_replacement=False):
+    w = weights if weights else [1]*len(data)
+    if with_replacement or weights:
+        return random.choices(data, weights=w, k=n)
+    res, d_c = [], list(data)
+    for _ in range(n): res.append(d_c.pop(random.randrange(len(d_c))))
+    return res
+  
diff --git a/Week03/shifted_kayraemre_karaosmanoglu.py b/Week03/shifted_kayraemre_karaosmanoglu.py
new file mode 100644
index 00000000..b4ac691b
--- /dev/null
+++ b/Week03/shifted_kayraemre_karaosmanoglu.py
@@ -0,0 +1,6 @@
+import statistics
+
+def shifted(data):
+  mean = statistics.mean(data)
+  median = statistics.median(data)
+  return abs(mean - median) / abs(mean) * 100 if mean != 0 else 0
diff --git a/weighted_kayraemre_karaosmanoglu,py b/weighted_kayraemre_karaosmanoglu,py
new file mode 100644
index 00000000..0a401055
--- /dev/null
+++ b/weighted_kayraemre_karaosmanoglu,py
@@ -0,0 +1,6 @@
+import random
+
+def weighted_srs(data, n, weights, with_replacement=False):
+    if with_replacement: return random.choices(data, weights=weights, k=n)
+    if not weights: return random.sample(data, n)
+    return random.sample(data, n, counts=weights)