In a week, Sarah recorded the time she spent studying each day. The times are as follows: Monday - 2 hours, Tuesday - 3 hours, Wednesday - 1.5 hours, Thursday - 2.5 hours, Friday - 4 hours, Saturday - 3.5 hours, and Sunday - 1 hour. What was the average time Sarah spent studying per day that week? Let's think step by step and output the final answer within \boxed{}.
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