Problem
Write a Python script using Pandas to merge two large datasets of customer orders and return the rolling average of order values per customer over a 30-day window.
Practicing as: Research Scientist interview at ChewyHi, I'll play your Chewy interviewer for the Research Scientist role. Candidates describe these interviews as often stressful and moderately difficult, so expect me to be direct and to the point. Take your time with the question above and answer like we're in the room.
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