CELL UNLOCKING The padlock symbol means you need to complete more questions in order to unlock that cell. Question: Complete the table below. As a reminder, the student responses were: 39, 24, 65, 48, 42, 75, 54, 42, 54, 45, 47, 54, 28, 46. Hours slept among surveyed students Minimum Maximum Range 3 3 3. Try this: see how the range cell only unlocks when you've completed maximum and minimum hours.