diff --git a/chapter-1/ex-22.py b/chapter-1/ex-22.py
new file mode 100755
index 0000000..7d567db
--- /dev/null
+++ b/chapter-1/ex-22.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+import numpy as np
+import random
+
+random.seed()
+def experiment(p, n, reps):
+    summed = 0
+
+    for r in range(reps):
+        heads = 0
+        for i in range(n):
+            if random.random() < p:
+                heads += 1
+        summed += heads
+    summed /= reps
+    return summed
+
+print("p: 0.3, n: 10, reps = 8, result X: ", experiment(0.3, 10, 8))
+print("p: 0.3, n: 100, reps = 8, result X: ", experiment(0.3, 100, 8))
+print("p: 0.3, n: 1000, reps = 8, result X: ", experiment(0.3, 1000, 8))
+
+print("p: 0.3, n: 10, reps = 1, result X: ", experiment(0.3, 10, 1))
+print("p: 0.3, n: 100, reps = 1, result X: ", experiment(0.3, 100, 1))
+print("p: 0.3, n: 1000, reps = 1, result X: ", experiment(0.3, 1000, 1))