Update app.py

app.py

@@ -58,7 +58,8 @@ final_answer = FinalAnswerTool()
 agent = CodeAgent(
     model=model,
     tools=[
-        generate_normal_distribution, 
+        generate_normal_distribution,
+        create_histogram_and_theorical_pdf,
         duck_search,
         final_answer
     ], ## add your tools here (don't remove final answer)