The amount of flour used each day is 15 pounds / 4 days = <<15/4=3.75>>3.75 pounds/day.
The average amount of flour in the bag changes by 3.75 pounds/day. Answer: \boxed{3.75}.
A restaurant uses a 15-pound bag of flour in 4 days. Each day, the bag of flour gets lighter as more flour is used. How much does the average amount of flour in the bag change each day? Round to the nearest hundredth.
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