medium10 pts · first answer countspandas

groupby with transform

What does this pandas code produce?

df["city_avg"] = df.groupby("city")["sales"].transform("mean")

A.One row per city with the average salesB.An error, because transform cannot use "mean"C.A new column where every row gets the average sales of its own cityD.The overall average sales repeated for every row

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groupby with transform

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