To find the average amount of flour used from the 15-pound bag of flour over the 4 days, we first need to determine the total amount of flour used and then divide it by the number of days.
- Total flour used: 15 pounds
- Number of days: 4 days
Now, we calculate the average amount of flour used per day:
\[ \text{Average flour used per day} = \frac{\text{Total flour}}{\text{Number of days}} = \frac{15 \text{ pounds}}{4 \text{ days}} = 3.75 \text{ pounds/day} \]
Thus, the average amount of flour in the bag changes by 3.75 pounds each day (rounded to the nearest hundredth).