การหาค่าเฉลี่ย

delivery_times = [19, 25, 35, 40, 28, 32, 29, 31]

# Find the average delivery time
average_time = ____(delivery_times) / ____(delivery_times)

# Round the average delivery time to two decimal places
average_rounded = ____(____, ____)

print("Average delivery time:", average_rounded)