I changed some code such as rolls and other things..

dice_stats.py

@@ -20,8 +20,8 @@ class FiveDice:
         return True
 
 dice = FiveDice()
-successes = 0
-trials = 1000000
+successes = 3
+trials = 10
 for trial in tqdm(range(trials)):
     dice.roll()
     if dice.all_ones():

die.py

@@ -15,3 +15,4 @@ class Die:
     def roll(self):
         self.face = randint(1, 6)
         return self.face
+

yahtzee.py

@@ -109,3 +109,14 @@ class Yahtzee:
             if die.face in choice_ints:
                 choice_ints.remove(die.face)
         return len(choice_ints) == 0
+
+def play(self):
+        """Play an entire game.
+        Starts by greeting the user, then plays rounds until all the goals 
+        have been used. When the game is over, tells the player their final 
+        score.
+        """
+        print("Welcome to Yahtzee!")
+        while self.count_unused_goals() > 0:
+            self.play_round()
+        print(f"Your final score was {self.score}")