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Scenario: Mercs for Money, a Professional Services enterprise, was founded by Wade Wilson, who gathered a team of mercenaries to create a successful business operation. Looking to optimize the organization’s operations, Wade has contracted you to assist with IT projects. Currently, the IT team is working with the company's sales data, which is stored in a Pandas DataFrame named df_sales . The DataFrame contains the following columns: year month day_of_month sales_total Wade wants to calculate the average value of sales_total . Question: Which code snippet should be used to compute the average sales_total value efficiently