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
create a function to calculate the average of four numbers.
user
def mean(num1, num2, num3, num4):
    return (num1 + num2 + num3 + num4) / 4
assistant