Exercise

Plotting averages

Perhaps you have a hunch that department stores see greater increased sales than average during the end of the year as people rush to buy gifts. You'd like to test this theory by comparing monthly department store sales to average sales across all three industries.

numpy is loaded for you as np, and the monthly_sales array is available. The monthly_sales columns in order refer to liquor store, restaurant, and department store sales.

Instructions 1/2

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Create a 1D array called avg_monthly_sales, which contains an average sales amount for each month across the three industries.