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pandas weighted average groupby

sales.groupby("Manager").apply(lambda x: np.average(x['New_Product_Price'], weights=x['Quantity']))
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pandas weighted average groupby

(sales["Current_Price"] * sales["Quantity"]).sum() / sales["Quantity"].sum()
(sales["New_Product_Price"] * sales["Quantity"]).sum() / sales["Quantity"].sum()
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