มอร์แกนชนะ The Masters Tournament กี่ครั้งโดยลงเล่นน้อยกว่า 12 นัด?
How many times did Morgan win The Masters Tournament with fewer than 12 appearances?
df = pd.DataFrame(columns=['wins', 'tournament', 'events'])
df.loc[(df['tournament'] == 'masters tournament') & (df['events'] < 12), 'wins'].mean()