1. **State the problem:** Find the median potassium blood level from the data set: 4.77, 5.89, 4.86, 3.63, 3.32, 3.32, 6.2, 4.44, 6.97, 5.59. 2. **Recall the median definition:** The median is the middle value when data is ordered from smallest to largest. For an even number of values, it is the average of the two middle values. 3. **Order the data:** 3.32, 3.32, 3.63, 4.44, 4.77, 4.86, 5.59, 5.89, 6.2, 6.97. 4. **Identify the middle values:** Since there are 10 values (even), the median is the average of the 5th and 6th values: 4.77 and 4.86. 5. **Calculate the median:** $$\text{Median} = \frac{4.77 + 4.86}{2} = \frac{9.63}{2} = 4.815$$ 6. **Round to three decimal places:** The median potassium blood level is $4.815$. **Final answer:** $4.815$