A 3-year-old child is brought to the emergency department. The mother states that the child has had flulike symptoms with vomiting and diarrhea for the past 2 days. On data collection the nurse finds that the child’s heart rate is slightly elevated and the blood pressure is normal. The child is irritable and crying only a few tears. The mother states that the child’s weight before the illness was 33 pounds. The nurse finds the current weight to be 31 pounds. The nurse correctly interprets this as which level of dehydration?