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Calculating the difference from hourly mean

Totals are useful, but deviations tell a richer story. Calculate how much each hour's rentals differ from the average for that hour across all days to quickly flag above-normal or below-normal demand.

polars is loaded as pl. The DataFrame bikes is available with columns time, rentals, temp, and hour.

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100 XP

Add a column diff_from_avg showing rentals minus the hourly mean of rentals.

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