as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
design a program that calculates the average of five numbers
user
"""
calculate the average of five numbers
"""

def calculate_average(numbers):
    average = sum(numbers) / len(numbers)
    return average

if __name__ == '__main__':
    numbers = [3, 6, 9, 12, 15]
    average = calculate_average(numbers)
    print(f'the average of {numbers} is {average}.')
assistant