ยอดคงค้างของลูกค้าสูงสุด ต่ำสุด และเฉลี่ยคือเท่าใด?
What is maximum, minimum and average amount of outstanding of customer?
df_customers = pd.DataFrame(columns=['amount_outstanding'])
{'max': df_customers['amount_outstanding'].max(), 'min': df_customers['amount_outstanding'].min(), 'avg': df_customers['amount_outstanding'].mean()}